Doing some night watching, I found a black jelly like half-dollar size creature on a rock. I saw what looks to be 2 antenae coming out. I can not seem to find it anywhere. It kinda looks like a black inflated mushroom
Sounds like it may be a nudibranch(sp). Some say they are good in a reef, some say bad. I would do a search on this board if other replies lien this way. I know there has been some discussion on this subject in the past. HTH