Need ID

[poomoon]

hi, can help ID these ? the other one seems like a sponge but branchng, very brittle, easy to break off. the other one also look like sponge due to big holes here and there, also start to take over zoas. doing major work now so wondering what to do with these. thanks.

[Terryz_]

You can scrape them off... and remove them..

Edited October 6, 2011 by Terryz_

[iskay]

They are sponges. While some reefers had a hard time keeping them alive, they are thriving in your tank. Can actually be a good thing if they are not encrusting over your precious corals. They filter and utilize organics, bacteria, and plankton and can be beneficial to your tank.

[poomoon]

thanks guys. yeah they are thriving but too much. i already removed them previously, only to come back, encrusting rocks and melted quite some zoas alrdy. previously also encrusted super sun head, grew around it, then slowly the head melted away.