Cerianthus are anemones, also known as cylinder rose. What makes them special is that they live in a tube made of parchment-like material that they excrete. Normally they bury themselves deep in the sand, the necessary substrate height can be a logistical challenge to the marine aquarist - one option is PVC tubes filled with sand. Cylinder roses are azooxanthellate and feed predatorily on fish or invertebrates. They should be actively fed and you may have to accept that smaller tank inmates will end up on their menu as well. The genus is widespread and has tropical species as well as species with northern or temperate distribution. Especially for the marine aquarium the species that have neon fluorescent coloration are particularly interesting.
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