I have a few things in my tank that are a little odd, to say the least. So the question is, besties, or beasties? Please give me some info on them and tell me what they are. This is the little pink guy in the middle, completely different, in my opinion, to the last pink guy I posted. This looks a bit like a cotton plants head, in a grayish version. This little dude, in the middle, is completely white, and has been expanding at a rate of knots. I think these guys look awesome, and they hitchhiked on my live rock, but I have no idea what they are, and if they are actually good, if they are, what are their requirements? Thanks for any and all help I may get in advance.