Is this a zoa? If not, what is it?

[Ray Floyd]

 

[saltyfilmfolks]

A Paly. keep an eye on it, some are not so bueno. ugly and they spread.

 

[Alfrareef]

And also very toxic. Be very very careful while handling.

 

[Ray Floyd]

And also very toxic. Be very very careful while handling.

Should I get rid of them?

 

[FLAdaboy]

Palythoa

 

[Alfrareef]

It's up to you. I keep one with fluorescent green just because it's with me for several years but it's away from the rocks and rarely touch her. When needed I wear gloves and always wash very carefully my hands after handling.
Google for more knowledge.