Just bought a brown brittle star today as part of my cleanup crew. I have a ten gallon nano. Anyway, I added him and he quickly moved into a cave and then towards the back of the tank where he curled into a little ball and has not moved since. I have no experience with these little guys, and I'm wondering if this is normal behavior. He's been there for about 4 hours now, and I would like to get to him and maybe pick him up to see if he's moving, but unfortunately the rock formation is preventing me from doing so. Thanks very much for the help.