Live Aquarium Fish - Coelenterates Urticant
Coelenterates Urticant (stinging) Coelenterates must be kept apart from the more delicate species: a safety margin of 10-15 cm is often recommended. The madreporites and anemones are among the most urticant, and they must not be put alongside a leather coral from the Sarcophyton genus, for example. Other alternatives for a Coelenterates tank are algae - whether encrusting or not - supported by live rocks, or even caulerpae. Their development must be controlled so that they do not end up smothering the Anthozoa. The introduction of certain fish is possible, even desirable, but there are cases of classic incompatibilities (see table, page 178). Specially designed artificial decor can be colonized quickly, depending on the organisms’ rate of growth and reproduction. This can sometimes make it difficult for even a practiced eye to spot the difference between artificial and natural decor in an aquarium which has been in operation for several months. WORMS Some species belonging to the Annelida, a group that includes the sea worms used as bait in fishing, live in a tube which they build themselves: these are known as The sedentary Annelida. The brightly colored branchial plume which sticks out of it traps oxygen, as well as the organisms which make up zooplankton. At the sign of any danger, or if the tank or its support are knocked, this branchial plume retreats into its tube. The feeding of Annelida in captivity is identical to that of Coelenterates. When you buy one, make sure that the branchial plume is functioning correctly and its tube is intact. It is best to buy a worm fixed to a piece of rock. Coelenterates can cohabit with algae - encrusting or otherwise - and even with small fish. In an invertebrate tank the development of algae must be restrained, so that they do not smother the Coelenterates (left, a Cerianthus).
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