Anemone, good or bad?

[Zoaeasy]

Hitchiker showed up in my Seahorse tank. Very small, at this point, about 1/4" . Any help with ID. I have done the Google search thing and still not clear if pest or present.
Needless to say if good will be moved out of Seahorse habitat.

 

[LBehr]

Doesn't look quite like the aptasia Ive had but probably still bad. Unless somebody can positively identify it I would kill it just to be safe.

 

[Zoaeasy]

Doesn't look quite like the aptasia Ive had but probably still bad. Unless somebody can positively identify it I would kill it just to be safe.

Thanks I killed it earlier today!

 

[BoneXriffic]

Thanks I killed it earlier today!

Thats a rare supermega rock anemone worth 500,000dollars....how do you feel now? Lol i actually dont know what it is but i had to