Ascidians or sponges

[Glloyd]

Can someone help me identify this black sponge stuff growing on my live rock? What eats it? How do I get rid of it?

[Mr. Wiggles]

Is it causing problems in your tank or is it just in an inconvenient location? As a sponge I would imagine manual removal or exposure to air and then careful removal should do the trick. I think that some angel fish eat sponges if you want to go that route, but they could cause issue with nipping LPS and other corals. Best!