Black Sponge

[plutoniumJoe]

My tank is growing black sponge. Wondering how common it is.

It can bee seen at the bottom of this rock and between the mushrooms on the top.

[skabooya]

OMG i love your mushroom rock. Never heard of black sponge though.

[lastlight]

Are you able to get a better pic of that? Interesting.

[ScubaSteve]

I've got some black sponge (along with a whole bunch of other sponges I've never been able to ID). Mine kind of grows like a mat over the rocks. How about you?

[Milad]

i posted something somewhere sometime ago on a rock with black sponge and people told me not to worry
actually i think seahorsefanatic was the one that said hes seen it a few times and its not harmful.

[xtreme]

I've had some of the same black sponge before. Coincidentally it was also on a purple mushroom rock.

[mark]

black sponge was the only thing I ever noticed my Blue Linckia eating.