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Marine Aquarium

Marine fishkeeping history

The first saltwater tanks were Venetian glass jars where the Romans kept anemones outdoors, but these systems were very short lived. The first personal saltwater fishkeeping began on a wider scale in the 1950s, starting with the basic rectangular glass aquariums (usually 20 gallon), still popular today. Bleached coral along with a substrate of coarse crushed coral were the norm. Algae, including beneficial types such as coralline algae, were viewed negatively and were generally removed. The clean, sterile tank was viewed as the healthiest.

During the early days of marine aquaria, saltwater was collected at local beaches. Natural saltwater contains many unwanted organisms and pollutants. Aquarium literature of the time suggests that the most commonly kept marine fish were the percula clownfish, sergeant major damselfish, small, brackish-water pufferfish and scats, jeweled blennies, and blue damsels. Aquariums were equipped with large air compressors, and were heavily aerated and filtered (primarily with undergravel filters, a norm for some time).

An ever-growing number of hobbyists experiencing the inconvenience of gathering natural sea water and the concurrent development of analytical chemistry techniques led to research into the chemical composition of sea water. Synthetic salt mixes were developed to replicate the chemical environment of the tropical ocean, including trace elements and salts. This advance made marine fishkeeping popular in areas without access to clean sea water.

Air driven, counter-current protein skimmers and reliable submersible electric heaters were invented in Germany. Various advances in filtration included trickle and hang-on filters, both allowing a more natural equilibrium in the aquarium environment. The advancement of fluorescent lighting technologies to provide higher output, along with metal halide lighting, enabled the first reef tanks, making it possible to keep corals and other invertebrates without natural sunlight.

More efficient chemical testing allowed aquarists to understand the chemical properties of aquariums. By the 1980s, a biologically-based understanding of how to maintain an artificial ocean environment brought more successful and widespread marine fishkeeping.

Modern fishkeeping

Marine aquarium components

The major components are an aquarium, usually made from glass or acrylic, filtration equipment, lighting, and an aquarium heater. Marine aquariums can range in volume from less than 80 liters, (< 20 US gal) to over 1,200 litres (300 US gal). Small volumes are more difficult to maintain due to the more rapid changes in water chemistry. The majority of saltwater aquariums are between 160 and 400 liters (40 and 100 US gal).

Nano reef aquarium maintained at home

Types of marine aquariums

Marine aquarists typically divide saltwater aquariums into those housing fish only, those housing fish with live rock, and those primarily designed to house corals and other invertebrates (also known as reef aquariums). Many fish hobbyists also divide the types of saltwater tanks based on the water temperatures at which they are kept.

Tropical marine

The most common type of saltwater fish tank, the tropical marine tank, houses marine animals from tropical climates. Usually kept between 24 to 28 degrees Celsius (76-82 F), these tanks include tropical reef tanks, as well as fish-only tanks. These tanks tend to have a low concentrations of microscopic plankton and other foods eaten by filter feeders. Most livestock for these aquariums are acquired through commercial means.

Temperate marine (coldwater marine)

A temperate marine aquarium

One of the more obscure types of fish tanks, the coldwater marine tank, holds fish of temperate climates, with temperatures ranging around 10 to 24 degrees Celsius (5075 F). While most of these tanks are not as aesthetically pleasing as their tropical counterparts, colorful species such as dahlia anemones and the ornate cowfish can be found. However most coldwater fish are gray or dull in color. Most colorful species are found in the western pacific. These tanks also tend to require extra skill to maintain.

Since coldwater cnidaria are rare and coldwater corals only occur at great depths, hobbyists are largely confined to fish, crustaceans and mollusks. Since there are very few commercially available coldwater fish, hobbyists usually have to physically acquire specimens. The most common way of doing this is by trolling or seining. Unlike commercially available tropical fish, whose behavior patterns and tank compatibilities are well documented, coldwater fish require much local ichthyology knowledge in order to maintain them.

Many temperate fish have specific local diet requirements, while others, like tautog (blackfish), will eat just about any crustacean or frozen foods. The blackfish should not be kept with crabs and mollusks, while other fish, like the oyster cracker toadfish, will do fine with any fish that is not small enough to fit into its mouth. Due to it being such a localized hobby, not many people go the route of local tanks. However, they are more cost-effective than reef tanks, cheaper and easier to maintain, and the fish hardier. Most coldwater hobbyists start at a young age, and it takes experience before one can successfully gauge the compatibility of the fish in your area.[citation needed]

Live rock

Main article: Live rock

Live rock is rock that has been in the ocean, composed of limestone and decomposing coral skeleton, usually around a coral reef such as those around Fiji, and is usually covered with beneficial algae, coralline and tiny invertebrates and bacteria that are desirable in the aquarium. Some examples of the microfauna commonly found on live rock are crabs, snails, feather dusters, brittle stars, starfish, limpets, abalones, and an occasional sea urchin, sea anemone, coral, and sea sponge. Also, if the aquarist is unlucky, a mantis shrimp. Bristleworms are also common, most of which, while unattractive, are not harmful and are useful scavengers; some species can be pests, however. The addition of live rock is one of the best ways to ensure a healthy aquarium, as the rock provides a buffer to maintain high pH (8.0-8.3), alkalinity, and acid-neutralizing capacity. Alkalinity is often known by a rather confusing term, “carbonate hardness”, or KH. This is usually measured in “degrees” (dKH) or meq/L.

The microfauna found on live rock are detrivores and herbivores (as they eat algae and fish waste), and provide fish with a natural, attractive shelter. Live rock usually arrives from online dealers as “uncured”, and must be quarantined in a separate tank while undergoing the curing process, which involves the inevitable die-off of some of the rock’s inhabitants and the subsequent production of undesirable ammonia and nitrite. Live rock that is already cured is available at most pet stores that cater to saltwater. Live sand is similar to live rock and is equally desirable.

Filtration

A new sump with three compartments including a protein skimmer

Main article: Filter (aquarium)

In general, marine aquariums have more complex filtration requirements than most freshwater aquariums. The various components frequently include Wet and dry filters and Protein skimmers. Protein skimmers are devices that remove organic compounds prior to their degradation, and are also very useful in marine aquariums. Protein skimming is also used in the popular Berlin method that relies on live rock, and periodic partial water changes to degrade and remove waste products. The Berlin method relies on large amounts of live rock being included in the aquarium. The rule of thumb is 1/2 – 1 lb. per 1 US gallon (0.2 – 0.4 kg per 4 liters).

Some marine aquariums also include a refugium and/or a sump. Refugiums are small containers or aquariums that are hidden behind or beneath the main aquarium and connected to it via a water pump. Refugiums have recently become quite popular among reef aquarists because they can be used to serve several purposes such as adding water volume or providing a fish-free site for biological filtration in live rock and/or the sandbed. Fish-free refugiums are host to populations of copepods, amphipods, isopods and other zooplankton. The sump may contain a number of compartments, each with its own filtration material. Often, heaters, thermostats, and protein skimmers are placed in the sump.

Lighting

A DIY metal halide pendant lamp

Regular cyclical lighting is used in aquariums to simulate day and night. This is beneficial for fish and invertebrates since it establishes a routine, enables them to rest, and makes them feel more secure. The lighting used varies depending on the inhabitants of the aquarium. Typically, the type of lighting for aquariums with fish only is regarded as unimportant. In aquariums containing invertebrates, however, where algal growth (of both free-living and symbiotic algae) is desired, more intense lighting is required. There are many types of lights available: some common types include fluorescent, VHO fluorescent (Very High Output), compact fluorescent, LED and metal halide. Actinic lights produce a deep blue spectrum designed to simulate the dominant wavelength of light a few metres below the ocean’s surface.

Many different sources make different claims about what type of lighting system is the best. In reality, each technology or variation has its own advantages and disadvantages. The most primitive lighting source is natural sunlight. This is only effective in areas near the equator because the intensity of sunlight is greatest there. Efficiently utilizing natural sunlight requires complex planning and, as such, this method is applied on only the largest reef systems.

The next step up in technology is incandescent lamps. These are very wasteful of energy, producing between 15 and 30 lumens per watt of power (Out of a possible 683 lumens per watt for an ideal light source). Standard fluorescent lamps offer a great improvement over incandescents. There are better color temperatures available in fluorescent tubes that are more suited to aquariums than those of regular light bulb. They are also more efficient, averaging between 90 and 95 lumens per watt. The downside to regular fluorescent lights is that they do not have the intensity to penetrate into deeper aquariums.

There are a number of improved variations of fluorescent technology. The main ones are very high output (VHO), power compact fluorescent (PC), and T-5 high output (HO). VHO lamps are fluorescent lamps run at higher power levels, usually about three times the standard wattage for a given bulb length. They have the advantage of high light output, but the larger diameter bulbs limit the efficiency of reflectors. PC lighting is also high-power fluorescent lighting, but the bulbs are folded to put more tubes in a given space. The output of PC lamps are reduced by inefficient reflector designs.

VHO and PC bulbs are also fairly expensive to replace. T-5 HO lights are the newest variation on fluorescent lights. They are run at slightly higher power levels than standard fluorescent lamps, but are made significantly thinner. This allows for more efficient reflector designs that get more light into the aquarium. Because of this, higher quality T-5 systems often match or exceed the output of equivalent compact fluorescent or VHO lighting fixtures. All types of fluorescent lighting offer the same efficiency in lumens per watt; it is the shape of the bulb and reflectors that makes their overall outputs different.

Metal halide lights are the next level up from fluorescent technology. Metal halides produce about 90-100 lumens per watt of power. This is roughly the same as fluorescent. The improvement with metal halides is that they concentrate this light output into a very small space, whereas fluorescent lights evenly illuminate the entire aquarium. This is often referred to as point source lighting, and is what causes the rippling visual effect on many advanced aquarium setups. This concentration of light output increases the intensity, allowing metal halide lamps to get a lot of light to even the very bottom levels of most aquariums. Metal halides are available in many color temperatures , from 6500 K up to 20,000 K, though bulbs as high as 50,000 K are occasionally found. The downsides of metal halide lighting are the cost and the heat produced.

Most metal halide fixtures are more than double the price of an equivalent wattage fluorescent system, though prices have begun to drop in recent years. Halide lamps concentrate heat as well as light output. The surface of an operating lamp becomes hot enough to cause second or third degree burns instantly, so this lighting technology must be used with caution. The heat produced can also warm the aquarium to unacceptable levels, often necessitating the use of a chiller. The most recent addition to the list of aquarium lighting technologies is LED lighting. These have the potential to be much more efficient than any other technology, but have not yet become so because of issues of heat dissipation. LED’s have the advantage of point source lighting, but are also completely dimmable at any power level. This allows for more advanced lighting schedules, even the simulation of cloud cover. So far, LED’s have found use mainly as lunar lighting.

When considering lighting for an aquarium, there are generally two factors to consider: wattage and color temperature. Depending on the type of lighting (i.e. fluorescents, metal halide, etc) the wattage of light emitted may vary considerably, from tens of watts to several hundred watts in a lighting system. Wattage, while not indicative of color, is equivalent to power and essentially determines how brightly the light will shine. Due to the scattering of light in water, the deeper one’s tank is, the more powerful the lighting required. Color temperature, measured in kelvins (albeit slightly unrepresentively) refers to the color of light being emitted by the lamp and is based on the concept of blackbody radiation. Light from the sun has a color temperature of approximately 5900 K and lighting systems with color temperatures >5000 K tend to be best for growing plants in both the marine and freshwater setting. 10,000 K light appears bluish-white and emphasizes coloration in fishes and corals. Higher up on the spectrum there are 14,000 K and 20,000 K bulbs that produce a deep blue tint which mimic the lighting conditions underseas, creating an optimal ambience for invertebrates and livestock present.

Heating

Most marine aquarium inhabitants are endemic to tropical reefs and waters in Africa, Southeast Asia, and the Red Sea. Marine aquarium temperatures should mimic the natural environment of the inhabitants and are most commonly maintained at 23 to 28 degrees Celsius (73-82 F). In regions where the ambient temperature is less than the desired temperature of the aquarium this generally necessitates the use of an aquarium heater. In some areas ambient temperature is greater than the desired temperature and refrigeration devices, known as “chillers”, are used to cool the aquarium water.

Water testing

Marine aquarists commonly test the water in the aquarium for a variety of chemical indicators of water quality. These include:

Specific gravity, a relative measure of water density, is normally maintained between 1.020 and 1.024 in aquariums with fish only, and 1.023 and 1.026 for aquariums containing invertebrates. Salinity should therefore be between 28 and 35 PPT, with the higher values being beneficial in advanced reef systems. Because salinity is by definition directly related to specific gravity, both can be tested with an inexpensive hydrometer or refractometer.

pH should be maintained between 8.1 and 8.3. This can be raised with a commercially available buffering agent or through calcium-rich substrata. Carbonate hardness (KH) should be between 8 and 12 degrees of carbonate hardness. A calibrated calcium reactor can assist in maintaining both pH and carbonate hardness. Using purified water from a reverse osmosis/deionization (RO/DI) unit can prevent KH and pH fluctuation.

The nitrogen cycle refers to the conversion of toxic ammonia to nitrite and finally nitrate. While fish waste (urine and feces) and decaying matter release ammonia, the majority of ammonia released (approximately 60%) in both marine and freshwater aquariums is excreted directly into the water from the fishes’ gills. Biological (bacterial) nitrification converts the ammonia into nitrite ions, NO2-, and then to nitrate ions, NO3-. Nitrate is readily taken up and assimilated by algae and hermatypic corals. Some nitrate is converted via an anaerobic bacterial process to free nitrogen, but this process is very difficult to maintain. In the recent past, most nitrate, which is less toxic to fishes and most invertebrates than nitrites, accumulated in the water until it was physically removed by a water change. However, many marine aquarists are now employing the use of a special section of the tank or separate tank altogether, called a “refugium.” A refugium is, as its name suggests, a sheltered area that shares water with the primary, or display, tank. Refugiums usually contain a deep sand bed to allow anoxic zones to develop within them where anaerobic bacteria can convert nitrate into nitrogen gas, a useful means of nitrate removal. Various types of macroalgae can be grown and harvested from the refugium as another means of nitrate export. As refugiums become more common in marine aquaria, nitrate levels are easily manageable for even the novice hobbyist. Ammonia and nitrite should be tested regularly; any detectable levels (i.e., over 0 ppm) can be indicative of a problem. Nitrates should not exceed 2 ppm in reef tanks, or 20 ppm in fish-only tanks. It is sometimes acceptable to have a small amount of nitrate buildup, as some livestock, especially fish, are fairly tolerant of nitrate. Most corals, while able to assimilate nitrate, cannot be expected to survive, much less thrive, with high nitrate concentrations.

Other suggested tests include those for calcium, carbonate alkalinity, magnesium, and other trace elements. It is often beneficial (and necessary) for the aquarist to research the water chemistry parameters for the specific organism that is desired.

Acclimation

Acclimation is a process that is performed when adding new marine life to an aquarium, particularly for invertebrates, who lack osmoregulation. This process slowly introduces the organisms to the water composition of the new environment, preventing shock resulting from sudden changes in water chemistry. There are several different methods of doing this, including the use of a drip line, or of a measuring cup or other device to slowly mix water from the aquarium tank into a container with the new animal.

Water changes

Water changes are a staple of good saltwater maintenance. Larger (approximately 200 gallon) aquariums are much more stable and water changes may not need to take place if the nitrogen cycle has fully established itself in the tank, although this is a controversial statement among aquarists. Water changes are used to maintain balance of calcium, carbonate alkalinity, and magnesium which are rapidly depleted in a reef aquarium, while also maintaining levels of other trace elements as well as removing toxic solutes which may accumulate from many different sources and are unable to be removed by even advanced filtration methods. Supplements are needed (such as calcium) when regular water changes alone are not able to maintain adequate levels, particularly those of calcium, carbonate, and magnesium. Water changes involve removing a fraction of the total volume of the aquarium, replacing that water with new pre-mixed saltwater. Pre-mixed saltwater has been dechlorinated and/or dechloraminatedypically with an additive such as bisulfite or through filtering. Water should be brought to the same temperature if more than a 5% change is occurring. Salinity should match that of the aquarium, or be dosed very slowly if altering the salinity. Aging and aerating saltwater (such as in a bucket with a powerhead or airstone) is recommended as good practice to allow the pH to stabilize.

Replacement water should be of the same source as the aquarium, whether it be reverse osmosis (RO), de-ionized (DI), distilled or from a municipal supply, in order to avoid drastic changes in water chemistry. In cases where one is replacing a tap water-based salt mix with a reverse osmosis-based salt mix, the replacement water should be added slowly over the course of several hours to avoid sending the aquarium inhabitants into osmotic shock. However, large water changes are not advised under routine circumstances anyways, so this is really irrelevant. Municipal, or tap water, is not recommended for a marine aquarium as it often contains high levels of nitrates, phosphates, and silicates and other dissolved solids which fuel the growth of nuisance algaes, particularly diatoms, which appears as a rust colored powdery algae and grows in the overabundance of silicates present in all tap water. Water filtered by a four stage process including mechanical, carbon, reverse-osmosis, and de-ionizing components is recommended as this can provide the easiest route to absolutely pure water. Four and Five stage RO/DI filtration units can be obtained for as little as $100 and are a cost effective means of converting tap water into water usable in a marine aquarium.

Conservation

Almost all species kept in marine aquaria at this time are caught in the wild, although tank-raised specimens are becoming increasingly common as a viable alternative. Only a few species such as clownfish are captive-bred on a commercial scale. Much collecting is done in Indonesia and the Philippines, where use of cyanide and other destructive collection methods, while discouraged, is unfortunately common. The majority of live rock is also harvested in the wild, and recent restrictions on this harvest in Florida have caused a shift to Fijian and aquacultured rock. Natural rock, because it is created by coral polyps, takes many years if not centuries to form, and is a vital habitat for countless marine species; thus, commercial-scale harvesting of naturally-occurring live rock has been criticized by conservationists. Additionally, many animal species sold to hobbyists have very specific dietary and habitat requirements that cannot be met by hobbyists (e.g. Labroides genus wrasses, the moorish idol); these animals almost inevitably die quickly and have markedly reduced lifespans compared to wild specimens. Often these specific environmental requirements cause improperly housed lifestock’s color and appearance to be poor. These issues are often downplayed by individuals and organizations with a financial interest in the trade. Hobbyists who support conservation should buy only certified net-caught fish (although ensuring the legitimacy of such claims can be difficult) or captive-raised fish, as well as farmed corals and to support legitimate reef conservation efforts. The majority of corals can be “fragged”, whereby a portion of a larger captive coral is separated and can subsequently be raised into an individual specimen, allowing for coral propagation within the domestic aquarium; the trade in frags (i.e. fragments) offers a fantastic opportunity for marine aquarists to obtain new and unique corals while limiting the impact on the natural environment. Rare species and those without a history of being successfully kept in captivity should be avoided.

Commercial front

Various businesses have brought a commercial front to fishkeeping, perhaps the largest being Marineland, Inc. With the advent of large scale business operations focusing on breeding massive quantities of specimens, marine fishkeeping has become much more widespread than ever before. Perhaps the biggest turndown in marine fishkeeping is the initial setup cost. A 100 US gallon (400 L) reef tank full of coral and equipment can cost in excess of $2,500 US. Aside from the difficulty, this is a large factor as to why freshwater fishkeeping is still so widespread in comparison to its marine counterpart.

References and further reading

Advanced Marine Aquarium Techniques, by Jay Hemdal

The Conscientious Marine Aquarist, by Robert Fenner

Invertebrates: A Quick Reference Guide, by Julian Sprung

Corals: A Quick Reference Guide, by Julian Sprung

Reef Invertebrates: An Essential Guide to Selection, Care and Compatibility, by Anthony Calfo and Robert Fenner

Aquarium Corals: Selection, Husbandry, and Natural History, by Eric H. Borneman.

Natural Reef Aquariums: Simplified Approaches to Creating Living Saltwater Microcosms, by John H. Tullock

External links

Pets: Fish and Aquaria: Marine at the Open Directory Project

RTAW Reefpedia, a Reef Keeping wiki maintained by the Marine Aquarium Societies of Australia

Protein Skimmer Info, a site giving information, specifications, reviews and DIY Plans for Protein Skimmers

Temperate Marine Info, a site giving information and providing resources for the coldwater marine aquarium hobbyist

v  d  e

Aquarium and fishkeeping hobby

Types

Freshwater aquarium Marine aquarium Brackish water aquarium Community tank Biotope Reef aquarium

Aquarium equipment and furniture

Filter Berlin Method Protein skimmer Deep sand bed Heater Refugium Calcium reactor Bog-wood and Driftwood Airstone Live rock Substrate Fishcam Aquarium fish feeder Aquarium lighting

Fish terms

Hardy fish Dither fish Algae eater Bottom feeder Tropical fish Coldwater fish Painted fish

Fish food

Flake food Feeder fish Bloodworms Brine shrimp Tubifex tubifex Daphnia Infusoria

Lists

List of freshwater aquarium fish species List of freshwater aquarium plant species List of freshwater aquarium invertebrate species List of marine aquarium fish species List of brackish aquarium fish species List of aquarium diseases

Other terms

Aquascaping Spawning triggers Reef safe MacQuarium Bath treatment

Aquarium magazines

Practical Fishkeeping Tropical Fish Hobbyist Koi Aquarium Fish International

People

Takashi Amano Herbert R. Axelrod Julian Sprung

Aquarium related companies

Tetra Sera Eheim Hagen

Categories: FishkeepingHidden categories: Articles needing additional references from July 2007 | All articles needing additional references | All articles with unsourced statements | Articles with unsourced statements from December 2008 | Articles containing video clips

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Alpinestars Dual Lightweight Durable Mesh/Suede Offroad MX Glove $39.95

Alpinestars Dual Lightweight Durable Mesh/Suede Offroad MX Glove $39.95

Alpinestars Dual Lightweight Durable Mesh/Suede Offroad MX Glove $39.95

Alpinestars Dual Lightweight Durable Mesh/Suede Offroad MX Glove $39.95

Alpinestars Dual Lightweight Durable Mesh/Suede Offroad MX Glove $39.95

Cycling $19.95 Covering interesting and varied philosophical terrain, Cycling - Philosophy for Everyone  explores in a fun but critical way the rich philosophical, cultural, and existential experiences that arise when two wheels are propelled by human energy. Incorporates or reflects the views of high-profile and notable past-professional cyclists and insiders   such as Lennard Zinn, Scott Tinley, and Lance Armstrong Features contributions from the areas of cultural studies, kinesiology, literature, and political science as well as from philosophers Includes enlightening essays on the varieties of the cycling experience, ranging from the ethical issues of success, women and cycling, environmental issues of commuting and the transformative potential of cycling for personal growth Shows how bicycling and philosophy create the perfect tandem Includes a foreword by Lennard Zinn, author and owner of Zinn Cycles Inc.

Looma Cycling $6 Looma Cycling

Cycling Thermostat $29.07 Pricing subject to change. Cycling Thermostat

Pro Cycling Manager 2011 $29.95 The Ultimate Reference for Cycling Fans!

Timbuk2 Eddy Cycling Cap $27.95 Timbuk2 Eddy Cycling Cap

Cycling Plus $12.49 Cycling Plus is the manual for the modern road cyclist. Whether you’re cycling weekly, an occasional new rider or a Tour de France fan you�ll find everything you need. Each issue is packed with buying advice and tests of essential cycling gear – everything from bikes to bags! Cycling Plus is the place to find training advice, nutrition secrets and practical tips guaranteed to improve your bicycling. It’s also full of inspirational rides, real-life cycling stories and entertaining riding-related features.

Cycling and Society $99.95 How can the social sciences help us to understand the past, present and potential futures of cycling? This timely international and interdisciplinary collection addresses this question, discussing shifts in cycling practices and attitudes, and opening up important critical spaces for thinking about the prospects for cycling.

Cycling Anatomy $21.95 Cycling Anatomy features 74 of the most effective cycling exercises, each with clear, step-by-step descriptions and full-color anatomical illustrations highlighting the primary muscles in action.

Pro Cycling Manager 2009 $19.95 Experience the intense thrill of a great cycling season!