Please ID pest?

[MW319]

I found two of these in my tank last night. One is on the base of this hammer and the 2nd one is twice as long and on a rock in the tank.

 

[Texas Reefer]

Is it a pineapple sponge?

 

[Katrina71]

It looks like a sponge to me too.

 

[JaaxReef]

Sponge!

 

[MW319]

Thank You, I pulled the one off my hammer prior to putting it back into the tank and I guess it’s ok to leave the one in the tank correct?

 

[c.poindexter]

Yes, They are perfectly fine to leave in the tank. Chances are that they will come and go.

 

[MW319]

Thanks