What has invaded my coral?

[Kenneth Hooper]

I integrated my 29 Gal with my 75Gal DT and noticed this sponge-like growth on a frag I have. What has invaded my coral and how do I treat it?

 

[ndrwater]

Can you get a better picture? Close up or macro maybe?
Sponge is generally a good thing and wouldn't need to be treated..

 

[reef lover]

Most likely just a sponge..if its bothering the coral pluck it off.