Crinoid's are harder to keep in small, newly established aquaria. Since you have one, the best thing you can do is try your hardest to care for it...an unfortunate experiment it is...first pick up a bottle of DT's Live phytoplankton or buy some Phyto paste from Wendell down at Ocean Aquatics...also ask him if he carries a zooplankton type ration. There is little conclusive evidence to support Crinoids being exclusive phytoplankton or zooplankton eaters...Start additions of these products, supplemented with regular weekly additions of live brine shrimp hatchlings enriched with Selcon. This is the best you can do for your new Crinoid, and who knows, maybe it will survive or you will learn something. If you want more detailed info on Crinoid biology just send me a private message.
Note: with extra additions of DT's, Zooplankton substitutes, brine shrimp etc. you will want to institute a more rigorous maintenance schedule with a focus on water changes.
Good Luck
Stephen
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