please help ID white fuzzy hitchhiker

[danielankeny]

Hi everyone! Please help me ID this hitchhiker on a button polyp frag. It appeared about a week ago and is branching and growing in size...(my apologies for the sub-optimal picture quality)

Thanks!

 

[LavaToad]

I have the same thing in my tank, not sure what it is but I think its a type of sponge

 

[danielankeny]

Thanks LavaToad!

 

[rookie07]

sponge...filter feeder thus a good thing.