Help with identification

[Sablah]

I recently got an already established tank, and there are three corals I would like help identifying. I believe the first one is a Green Star Polyp, I'm not sure about the second one, and the the third one is some kind of mushroom. Anyone know what they are? I want to make sure to care for them properly and I don't know if they have any special care requirements or tankmate compatibility issues.

Thanks!

 

[Easy Reefing]

The second pic looks like a green star polyp, there’s different variation of GSP. Not sure though.

 

[Sablah]

The second pic looks like a green star polyp, there’s different variation of GSP. Not sure though.

Alrighty, thanks!