I have a couple little stars in my tank, they are about 1/4in. big and some have 5 legs and some 6.... i only see them sometimes then there gone. sorry i can't get a picture rite now, i will later if one is needed
Thanks
PERSONALLY i feel they are a nuisance, and can get to nuisance levels quick.
there are tons of different species, some are algae eaters, some are detritus orders. i've seen some pics of them eating coralline algae, i have found them on my zoanthid corals, and i've heard of them eating SPS corals.