What kind of coral is this?

[Vlrm23]

With a new chunk of fiji rock, we found this coral. Its flat and fleshy, with a greyish green and purple color to it. Its also porous with feather duster like edges.

 

[Maya]

Looks like maybe encrusting sponge.

 

[Vlrm23]

I dont think its a sponge. When the lights come on, it grows a little and feather duster looking things emerge from the edges.

 

[Vlrm23]

I was actually was just browsing my old posts and found this that has actually grown into a leather coral.



right there in the upper right hand corner.