Please do not get one, they are exceedingly difficult to keep. There are very few individuals that I've heard of keeping them beyond a few months.
They in general do not survive in our tanks. Most crinoids feed on specific particle sizes, and only seem to survive in very large mature reef systems with very large refugiums. But even then, it is sporadic. You can not typically add most bottled foods...at best you would have to add regular phytoplankton culture/diatoms if you could identify which species you have.
Most will absolutely die in our tanks and I would strongly discourage buying it.
At a minimum you should have a mature reef tank (no less than 1 year old) with a mature refugium, and clear indication of success with filter feeders and invertebrates reproducing.
