Coral identity

[UKReefer67]

Hello all, can anyone let me know what type of coral this is please? Also has what looks like a sponge attached, should I remove this?

 

[Auquanut]

Looks like some kind of clove polyp. I wouldn't worry too much about the sponge.

 

[Billdogg]

I'd leave the sponge and remove the polyps if it were my tank. They will spread pretty quickly if you aren't careful. What else do you have in the tank?

 

[Uncle99]

Looks like a drab GSP to me.
Can move quickly when established and choke out some corals.

 

[C. Eymann]

I believe this is briareum stechei, it will mostly encrust but will also grow out "nubs" or branch out horizontally a bit