I'm still fairly new to this. I have a green brittle star that is about 12" in diameter. Just found out from the guys that Trop. that they will eat fish. So I moved him to my sump for the time being till I can give him to Trop. My question is he ok down there? Should I put any food down there, how long is too long to keep him down there. The only reason is my 4 year old is kind of attached to it.