Anemone or corallimorph?

[PeterEde]

What's the difference?
I found this on my tank. About 1cm across. Any idea?

 

[KrisReef]

That one is pretty. Anemone. Kind? Hopefully it is not invasive.

 

[EeyoreIsMySpiritAnimal]

What's the difference?

Corallimorphs are mushrooms and anemones are anemones.

 

[Jekyl]

@Lost in the Sauce

 

[Lost in the Sauce]

Oh snap. At 1cm who knows.. @Eagle_Steve recognize this guy?