GSP or something else? ID help

[Camões1689]

I got this frag for free from LFS, the guy wasn't at all knowledgeable about the marine side. I thought it was GSP but after having it settle in the tank he doesn't look like GSP. Any ideas if this is GSP that is still acclimatising or anything else?

 

[blaxsun]

It looks like a green hairy mushroom. They can potentially grow/spread as fast as GSP.

 

[Troylee]

Agreed! Fuzzy shroom

 

[Dburr1014]

I'm going to lean towards elephant ear mushroom by the way it looks.

 

[skimmerman]

Definitely hairy mushroom I have some my favorite next to my sps