[HitchHicker] is this an anoneme and is it a pest?

[reefo420]

sorry for the bad picture quality, is this a bad hitchhicker? he came with a coral rock
there are 2 different ones

 

[ISpeakForTheSeas]

Looks like some ball anemones - should be harmless.

Edit: More info from one of my other posts:
That's a Corallimorph (taxonomic family Corallimorphidae)/Ball Anemone - despite the name, they're actually related to (and could be considered to be a kind of) soft mushroom corals.

They're generally harmless, though some species can spread enough to cause issues.

 

[EeyoreIsMySpiritAnimal]

Probably a ball anemone but possibly a hidden cup coral...