Need some help with ID

[Password]

I have looked to see if I could find out what this is but no luck..surprising enough I did see alot of other things I might get and some I hope I don't. I am getting these off white if not clear things growing on my substrate and live rocks. Any help will be much appreciated. This is my first time posting so please excuse me if I am not posting in the correct place.

 

[Schism]

I have looked to see if I could find out what this is but no luck..surprising enough I did see alot of other things I might get and some I hope I don't. I am getting these off white if not clear things growing on my substrate and live rocks. Any help will be much appreciated. This is my first time posting so please excuse me if I am not posting in the correct place.

First one looks like a sponge, the other 2 may be as well.

 

[Password]

Wow that was a quick response. Thanks for the info. Should they stay or should the go?

 

[Schism]

Wow that was a quick response. Thanks for the info. Should they stay or should the go?

They are filter feeders, so they will not be a problem, actually beneficial.

 

[kdpuffer]

Same opinion here, they look like sponges and if so are harmless.

 

[Smitty]

They are harmless, but they can take over sections of your tank if you let them.