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Yellow Sea Cucumber
(Colochirus robustus) Expert Peaceful 3" Omnivore (filter feeder) Substrate & Rocks 55 gallons Yes 72-78° F, dKH 8-12, sg 1.020-1.025, pH 8.1-8.4 None Yellow Indian Ocean, Western Pacific Cucumariidae Cucumbers The Yellow Sea Cucumber originates from the Indian Ocean and is a highly sought after specie in the aquarium trade for its bright coloration and unique appearance. Yellow Sea Cucumbers are a bright yellow color and have an elongated body with branch-like projections near its mouth. When feeding, the Yellow Sea Cucumber extends their branched feeding arms into the current to catch prey floating in the currents. Yellow Sea Cucumbers make very attractive filter feeders for an established reef aquarium. If kept in small groups, the Yellow Sea Cucumber may spawn in the home aquarium. They may also reproduce by dividing into 2 individuals; however, this may come about due to stress, or may be a sign of good health. The Yellow Sea Cucumber requires live rock to provide the nutrients it needs to sustain its health. It will usually find a location with moderate to strong current in which it can filter-feed plankton any other organisms from the water current. If attacked or injured, the Yellow Sea Cucumber may release mild toxins, but due to its small size, will not pose a threat in the average sized aquarium. The Yellow Sea Cucumber is very sensitive to copper-based medications and it will not tolerate high nitrate levels. The diet of a Yellow Sea Cucumber should include liquid or dried phytoplankton and zoo-plankton. They will also benefit from the substrate being stirred regularly releasing bacteria and detritus into the water. When malnourished, they will shrink in size, and may loose feeding arms; therefore, if these signs are noticed, increase the number of feedings, and target the cucumber with the appropriate food. Caution! Yellow Sea Cucumbers have the ability to releases toxins (venom) that may kill fish in the aquarium when they are severely stressed or damaged by pump intakes or overflows. Do not keep any Yellow Sea Cucumbers with any species of fish that may pick on on the tentacles. These fish include; Butterflyfish, Large Angels, and any species that is listed not safe with invertebrates.
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Tiger Tail Sea Cucumber
(Holothuria sp.) Easy Semi-Aggressive 12 to 18" Omnivore Substrate & Rocks 55 gallons Yes, With caution 72-78° F, dKH 8-12, sg 1.020-1.025, pH 8.1-8.4 None Brown, Colors change for Camouflage Indo-Pacific Holothuriidae Cucumbers The Tiger Tail Sea Cucumber or Sand Sifting Sea Cucmber is also commonly referred to as the Tiger Tail Sea Cucumber within the aquarium trade. The Tiger Tail Sea Cucumber has a long, gray to chestnut-brown body with white spots and numerous spiny papillae. The body of this sea cucumbers is cylindrical in shape and have blunt ends. This species can grow up to 6 feet in length in the wild, but most will only reach around 12" to 18" in the aquarium environment. This species requires a sandy bottom substrate, as it is a sand-sifting feeder. Also the Tiger Tail Sea Cucumber should not be housed with any species that may attack or injure it, as its defense mechanism is to release toxic chemicals into the water to defend itself, which can kill other species within the aquarium. The Tiger Tail Sea Cucumber is one of the few species that attaches its lower body to the inside of its shelter and only extends its anterior half when searching for food. Its meals consist of whatever algae, bacteria, and meaty items that are present in the sand as it is sifted through the Tiger Tail Cucumber. Due to its feeding habits, it will require a larger tank with a thick sandy bottom and rock caves for shelter. The Tiger Tail Sea Cucumber is very sensitive to high levels of copper-based medications and will not tolerate high nitrate levels. Water intakes from pumps or similar areas should be blocked off from this species, so that it is not sucked into the intake and injured or killed. It will need to be kept with peaceful tank mates to avoid potential problems, as if it feels overly threatened, it will retract back into its shelter, but if this does work and it is attacked or injured, it will expel its internal organs, which may be toxic to fish. This species is a sand-sifting feeder and if the tank is not overstocked, the Tiger Tail Sea Cucumber does not need supplemental feeding. Because of its feeding habits it is best to keep only 3 inches of worm for every 20 gallons of water.
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Sea Hare
(Aplysia sp.) Expert Peaceful 12" Herbivore Substrate 75 gallons Yes 72-78° F, dKH 8-12, sg 1.020-1.025, pH 8.1-8.4 None Green, Brown Caribbean Aplysiidae Cucumbers The Sea Hare is actually a marine slug that gets its name from its oral tentacles, which give it the look of a rabbit, hence its common name. The Sea Hare's body is a combination of patterns and speckles that give it a very unique appearance. One potentially very hazardous defense mechanism of the Sea Hare is its ability to release deadly toxins in the water if threatened or killed. Thus, it is very important to not keep this species with others that would attempt to do it harm and it is important to make sure that the Sea Hare cannot get sucked into any filter apparatus that could also kill it. If the Sea Hare is to release its toxic dye into the water, chemical filtration along with a partial water change should be able to remove it, or at least to non-toxic levels. If left alone the Sea Hare is simply an interesting herbivore that will gladly snack on Caulerpa and other similar vegetable items. The Sea Hare prefers to forage for food in shallow areas of water with shaded areas of sea grass or coral rubble. In the aquarium environment, covered areas without direct lighting should be provided. The Sea Hare can reach a large size (12 inches) and also requires a wide area in which to roam, and therefore is only suitable for larger aquariums kept by expert marine aquarium hobbyists. The aquarium setup should contain live rock and large shaded areas of sandy or fine rubble where the Sea Hare can graze on algae and Caulerpa. It is also important to make sure that all filtration or anything that could suck in or cause harm to the Sea Hare are covered to prevent the Sea Hare from injuring itself. If regular feedings of Caulerpa are not possible, the Sea Hare will need a supplemented diet of parboiled lettuce and dried kelp. Caution: The Sea Hare may secrete or releases toxins that may kill fish in the aquarium. The species may release toxic compounds when stressed, or release toxic compounds when it dies. It is important to handle this species with care at all times and to never keep it with species that may attempt to harm it. It is possible for the toxic secretions to poison an entire aquarium.
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Sea Cucumber
(Holothuria sp.) Easy Peaceful 12" Omnivore Substrate 75 gallons Yes 72-78° F, dKH 8-12, sg 1.020-1.025, pH 8.1-8.4 None Black, Green, Purple Atlantic Ocean, Caribbean Holothuriidae Cucumbers Sea cucumbers, are a very unique group of echinoderms in that they are the only class that is soft bodied rather than hard with well-developed circular and longitudinal muscles. Their mouth and anus are located at separate ends of the sea cucumber's elongated body. The mouth is surrounded by modified tube feet that form a ring of tentacles. Sea cucumbers are sessile and very sluggish; they ingest large amounts of sand extracting any food items while filtering out the cleansed sand, thus making them excellent sand sifters and a great part of a cleaning crew for a larger aquarium. While it does not have the toxic tubules of Culvier that many cucumbers have, if frightened, it can eviscerate parts of, or its entire internal mass (intestines) to ward off prey. In the wild, these organs often regenerate, but rarely in an aquarium setting. Sea cucumbers do well in large aquariums (generally 75 gallons and up) that provide plenty of open sandy space for the Sea cucumber to roam. For every 3 inches of sea cucumber there should be about 20 gallons of water. The Sea Cucumber will spend most of its time in the open, and needs to be kept with peaceful tank mates. It is sensitive to high levels of copper-based medications and will not tolerate high nitrate levels. Sea Cucumbers get their food by crawling along the bottom of the aquarium (substrate needs to be sand) where they sift the sand ingesting both plant and animal material that is in the substrate. If they are not overstocked in the aquarium, then not supplemental feeding is necessary. It is important that the substrate in your aquarium be a sand or fine grain substrate as the Sea Cucumber must sift through the substrate to extract its food.
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Sea Apple
(Pseudocolochirus violaceus) Expert Peaceful 8" Filter Feeder Substrate 55 gallons y 72-78° F, dKH 8-12, sg 1.020-1.025, pH 8.1-8.4 None Blue, Red, Orange, Yellow Indo-Pacific Cucumariidae Cucumbers Sea Apples are only for expert reef aquarists. Their bright coloration and unique shape make them very attractive, but they are difficult to keep and can even release a potent toxin if stressed or injured killing other animals in the aquarium. The body of the Sea Apple can be a vareity of colors, but it always has yellow feet. The oral region is usually blue to violet, hence the common name Violet Sea Apple or Violet Sea Urchin. This a beautiful species that will add a new dimension of color to the reef aquarium. Be sure to have a large established reef aquarium with both suitable space and solid quantities of copepods and other microorganisms suitable for filter feeding invertebrates. Most of be sure to have near perfect water quality and many years of successful complex reef keeping experience. Sea Apples require an established reef aquarium with both room to move about and large amounts of live rock and copepods from which it will receive a large portion of its food. Being a filter feeding species the Sea Apple requires moderate to strong currents within the aquarium. Protect all intakes on pumps and power heads, to eliminate any possibility of being sucked in, as this will both kill the Sea Apple and cause it to release deadly toxins into the aquarium. Do not house these cucumbers in an aquarium that contains any fish that may pick on its tentacles. Generally, any fish that is prone to pick on feather dusters will pick on the tentacles of the Sea Apple. These fish include; Butterflyfish, Large Angels, and any species that is listed not safe with invertebrates. They are ultra-sensitive to alkalinity changes and copper-based medication and extreme nitrate levels. This species is only for the expert reef aquarist. Sea Apples are filter feeders, which extend their tentacles into the water current to filter out their food. As the food is trapped within the tentacles it is then drawn back into the mouth. In the aquarium environment, it is necessary to provide liquid foods, brine shrimp or grated mussel. Typically Sea Apples are fed 3 times a week, but this will vary with the availability of food sources in the individual reef aquarium. Sea Apples have the ability to releases toxins (venom) that may kill fish in the aquarium when they are severely stressed or damaged by pump intakes or overflows. Do not keep any Sea Apple with any species of fish that may pick on on the tentacles of the Australian Sea Apple. These fish include; Butterflyfish, Large Angels, and any species that is listed not safe with invertebrates.
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Black Sea Cucumber
(Holothuria atra) Expert Peaceful 24" Omnivore Bottom 125 gallons Yes 72-78° F, dKH 8-12, sg 1.020-1.025, pH 8.1-8.4 None Black Indo-Pacific Holothuriidae Cucumbers The Black Sea Cucumber, or as it is often referred to as the Black Cucumber, Black Sea Urchin, or Lollyfish, has a long black body with a few spots. This species is usually found living in sandy bottom areas where it will often partially cover itself with sand. This is a very peaceful species, but can be dangerous if it is stressed or killed, as it can release dangerous toxins into the water. In the aquarium environment these toxins can be fatal to other species in the aquarium including fish. The Black Sea Cucumber needs to be kept with peaceful tank mates, that will pick at it or cause it undue stress. Do not overstock an aquarium with the Black Sea Cucumber, in general, keep only 3 inches of worm for every 20 gallons of water. The Black Sea Cucumber is very sensitive to high levels of copper-based medications and will not tolerate high nitrate levels. Being a sand sifting organism, it is important that the Black Sea Cucumber be kept in an aquarium with a sand bottom, so that it will be able to burrow and feed. The Black Sea Cucumber is a sand sifter and will ingest large amounts of sand eating any small food particles present in the sand and then expelling the clean sand. The Black Sea Cucumber is an excellent sand sifter and keeps the aquarium substrate clean and free of dead spots where excess food can break down in the substrate fouling the water. Black Sea Cucumbers have the ability to releases toxins (venom) that may kill fish in the aquarium when they are severely stressed or damaged by pump intakes or overflows. It does not have tubules of Culvier, but in the wild, if it is attacked or injured, it will expel its internal organs, which can be toxic to fish. After the Black Sea Cucumber escapes, it will regenerate those organs, although this regeneration rarely occurs in an aquarium setting.
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Australian Sea Apple
(Pseudocolochirus axiologus) Expert Peaceful 10" Filter Feeder Middle to Top 55 gallons Yes 72-78°F; sg 1.023-1.025; pH 8.1-8.4; dKH 8-12 Filter foods Blue, Bright Yellow, Red Northern Australia Cucumariidae Cucumbers Australian Sea Apples are only for expert reef aquarists. Their bright coloration and unique shape make them very attractive, but they are difficult to keep and can even release a potent toxin if stressed or injured killing other animals in the aquarium. The body of the Sea Apple, or Australian Sea Apple, is light to dark blue, and it has red feet. The tentacles are violet, blue, red, and have white tips. This a beautiful species that will add a new dimension of color to the reef aquarium. Be sure to have a large established reef aquarium with both suitable space and solid quantities of copepods and other microorganisms suitable for filter feeding invertebrates. Most of be sure to have near perfect water quality and many years of successful complex reef keeping experience. Australian Sea Apples require an established reef aquarium with both room to move about and large amounts of live rock and copepods from which it will receive a large portion of its food. Being a filter feeding species the Australian Sea Apple requires moderate to strong currents within the aquarium. Protect all intakes on pumps and power heads, to eliminate any possibility of being sucked in, as this will both kill the Australian Sea Apple and cause it to release deadly toxins into the aquarium. Do not house these cucumbers in an aquarium that contains any fish that may pick on its tentacles. Generally, any fish that is prone to pick on feather dusters will pick on the tentacles of the Australian Sea Apple. These fish include; Butterflyfish, Large Angels, and any species that is listed not safe with invertebrates. They are ultra-sensitive to alkalinity changes and copper-based medication and extreme nitrate levels. This species is only for the expert reef aquarist. Australian Sea Apples are filter feeders, which extend their tentacles into the water current to filter out their food. As the food is trapped within the tentacles it is then drawn back into the mouth. In the aquarium environment, it is necessary to provide liquid foods, brine shrimp or grated mussel. Typically Australian Sea Apples are fed 3 times a week, but this will vary with the availability of food sources in the individual reef aquarium. Sea Apples have the ability to releases toxins (venom) that may kill fish in the aquarium when they are severely stressed or damaged by pump intakes or overflows. Do not keep any Sea Apple with any species of fish that may pick on on the tentacles of the Australian Sea Apple. These fish include; Butterflyfish, Large Angels, and any species that is listed not safe with invertebrates.
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