Originally Posted by
Flower
http:///forum/post/3117011
Sea stars like the rock or sand, that is where the food is. Breeding, fighting for territory and eating is all any critter does. Since there is no glass in the ocean...there are no stars that like the glass, they may get on it, but not stay there.
I had a red knobby star that stayed in the open pretty much...moved around allot. I have read they are not reef safe, but I had mine for over a year in a 55g. Here is a picture. He didn't bother any corals at all.
This is Echinaster echinophorus and is reef safe and not a threat to corals..
It is not the same knobby star that typically goes by that name...or otherwise called chocolate chip, red African star or general star all in the genus Protoreaster.
Did yours die or did you give it away? Like Linckia, it is a surface film grazer or sponge eater and many or most will starve without enough live rock. It is not common overall in the hobby, but it turns up occasionally.