Weird yellow stuff on hammer coral

[blazedmasta]

Hey everyone, came in today and noticed some yellow stuff almost completely covering the stock of my hammer. Anybody have an idea what this is?

 

[cromag27]

Sponge.

 

[Tahoe61]

Sponge.

Yuppers.

I would not be too concerned unless the coral is not expanding as expected. If that is the case remove the frag and use a soft tooth brush to remove the sponge. I think it's pretty.

 

[blazedmasta]

OK thanks everybody.