Is this a nudibranch under my zoa?

[CoralBlue]

I thought whatever this thing wasn’t alive until my cleaner shrimp sweeped by and it went back under the zoa fast. Kind of looks like a little anemone but it’s movement was weird. Anyone know what it is?

 

[MERKEY]

aptasia...can become a big pest if left.

 

[CrayHawk]

Aiptasia. Bad guy.

 

[CoralBlue]

aptasia...can become a big pest if left.

Thing moved!! Fast!!!! Alright I’ll be doing my research to kill it.

Aiptasia. Bad guy.

Creepy little thing, will be killing asap.