are these sponges or fungi

[mcse0463]

I have noticed these half ball looking things growing on the the tank glass and on the rocks they are a creamy white looking
and kind of pourous
any ideas

[MalHavoc]

could be a sponge. Can you post a picture?

[Blown 346]

Sounds like normal sponges, some will be white, bash or even yellow.

[mcse0463]

I have added a picture of the sponge or?

[Dano999]

Don't know what it is but here's a link to help you post a picture in the thread.

http://www.ximinasphotography.com/le...central_4.html

[avshockey311]

pineapple sponge, harmless filter feeders.