What is this anemone

[tiffany1983]

This anemone was gifted to me and the gifter got it because it was ‘pretty’ but has no idea what it is. I’m afraid to put it in my tank with my fish. My research is telling me it could be harmful to my fish but wanted to ask some experts before I decide what to do with it. They got it from Petco and they don’t do saltwater returns. Please help! What is this thing?

 

[Peace River]

Likely a condylactis.