Help in identifying this anemone

[Porcupine Reefer]

There is three of these in my tank as of now, should I be concerned with them?

 

[StartingATank]

Ball Anemone? It also kind of looks like some kind of euphyllia

 

[kizzy89]

I'll second that, ball anemone. Do some research on them and decide if it's worth it to keep in your tank, i have one and haven't removed it but you might feel different about it.