You will struggle to find anyone that has managed to keep one for longer than a year, even marine biologists have to research them in the wild because they can't be kept long enough in captivity to study properly.
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Yeah, crinoids have specific particle sizes for foods they'll catch and eat (and to make matters worse, that specific size varies from species to species), but the real issue is that - much like with current "impossible" starfish - we don't know what they get their nutrition from. We know what some of them eat, but, like some species of filter feeding bivalves, they'll eat literally anything (including inedible things like sand and plastic beads) as long as they're sized properly. For obvious reasons, sand and plastic do not provide good nutrition to filter feeders, but they still consume these things. So, the real trick to keeping these guys would seem to be figuring out what they derive nutrition from.Crinoids would be as specific as possible...I'm not sure I've ever heard any reliable success stories with them even lasting months except for 1 or 2 in Coral Magazine because they're so particular about the particle size of their foods along with what the food is as well of course.