I love my inverts, and after trying different ones, I think I have found the things I love the most. Beleive it or not, it's my Green Brittle star, and my serpent star. I mean these guys are hardy, and very cool to watch!! Everytime I feed the tank they come out and eat, and when they pick up brine shimp, it travels from one end of the arm all the way to the disc, it looks like a convaor(sp) belt. And tonight was the funniest thing, a couple of pieces of formula one made it to the bottom (cut up of course), and of course the stars come out and my serpent found a piece and stuck it in his disc, the whole darn piece, and his disc kinda got outta shape, then the same one found another piece, stuck it in his disc, and this time he looked like a cone head!! LOL, I don't know how he fit those two pieces in there, but after that he ran under a rock, and probably thought to himself.....wow I ate too much. LOL I also recommend a black spiny urchin, he is very cool and very hard, and loves to just clean away.