Nuisance Sponges

[bychance]

I've had small white sponges (?) growing in my overflows for some time. They look like small cotton balls, about half the size of a pencil eraser. I've never really worried about them, I figured it was added bio diversity... But.. Now they are making their way into the display tank and onto the live rock.

Any body have any experience with these?
Should I do something to get rid of them?
Just let them be?

Thanks,
Paul

[mokeyz]

They are commonly termed Pineapple Sponges. They are harmless in my experience, good filter feeders, will wax and wane as your tank matures. If they encrust a pump then just scrape them off.

Regards,
Marlene

[nikon187]

+1.. they will be gone just as fast as they popped up. They are completly hamless

[bychance]

Thanks!