Quote Originally Posted by Kristy View Post
Some sponges might be cooler than the GSP! We have definitely had a couple of occasions where the sponge killed off the coral. One is a GSP rock that is now covered in a funky yellow sponge. Other was a beautfiful zoa rock that was overtaken by this dark purple / black sponge. Someone saw it in my tank (Mizeny maybe?) and commented that she's had problems with that same kind of black sponge killing coral. So yeah, it definitely happens.
You beat me to it. As soon as I saw the topic I thought of your yellow sponge. lol