Help ID this coral

[kar2oons]

Hi had this small coral in my tank and after some time it has grown, not sure where it came from but want to make sure it isn't something bad?

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[reefer55]

Looks like a mushroom, either ricordea or rhodactis

 

[etannert]

+1 fuzzy green mushroom.

 

[kar2oons]

Thanks guys wasn't sure what I had in there. What about the one on the right in this picture? I picked it up from a guy about a month ago as one polyp and he said it was a moon polyp, from what I have looked up it looks like a "Palythoa Grandis" what do you think?

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