ID please

[kona]

Anyone know what this is?
Its spongy. My bicolor blenny eats at it occasionally.

 

[bustedup21]

It looks to be a sponge. I have a couple of similar critters growing in my tank. The ones that I have are orange in color and black in color. I seen a thread not but a few days ago where another reefer lost a colony of zoos to a white looking sponge. It basically covered the entire zoo colony. He was able to pull and brush to get some of the stuff off and salvage a couple of pollups but he still lost quit a bit. Just my opinion. Hopefully someone else has better info for you.
Steve H

 

[kona]

So I looked up sponges on the internet and on this forum and I don't think what I have looks like a sponge. Here are two more pictures.
The thing, whatever it is, is actually relatively smooth on the surface, with very very small pores. It looks rough in the first picture because the bicolor blennie chomps on it.
The second picture shows a tentacle like extension of the thing.

 

[kona]

Picture 1

 

[kona]

Picture 2

 

[thomas712]

Yep sure is a sponge, if doing a google search change your wording to "white encrusting sponge" and I'll bet you find a few pics on it.....I did.
thomas

 

[ophiura]

Agreed, I've got some of that too. Definitely can form bizarre shapes but some species of sponge do that.