ID Please

[xnmuller]

So being new at this, everything I see is also new. What is this long stringy purply stuff. I hope it turns out better than when I discovered aiptasia.

[whatcaneyedo]

Looks like some sort of sponge growth (porifera). I have something similar growing under my rocks. Its a harmless filter feeder.

[ScubaSteve]

Looks like a sponge. Harmless and beneficial. I have the same kind of sponge in my tank (is it kind of purple and there might be a large opening in the middle of the bulk on the rock?). To my understanding it has not been described by science so there is no scientific name I could give you for more info.

[xnmuller]

Thanks for the information, I was a little worried it was a nuisance and would take over or something.