I've been reading this forum for awhile and had a question on what something was. I bough a small queen conch last night and today I saw an arm (or somthing) come out after it. The thing came out from under a piece of rock about 4-5 inches, and had white bristles on it. It was pulling the conch in toward the rock. My only guess is that it kind of looked like a brittle star, but it was white colored.
I attached a picture
I attached a picture