<a href=showthread.php?s=&postid=8283750#post8283750 target=_blank>Originally posted</a> by Qwiv
It is a flat worm. They are pretty common. There are a few bad ones that eat corals so keep an eye on them until you know they are the safe kind. I don't see legs on them, so thay aren't an isopod or any other "pod".