I agree with NYREEFNOOB.
It is best to always dip your zoas and check for eggs. I forgot to dip a few zoas and sure enough, I was battling zoa eating nudi's for over a year.
The only way I eradicated them out of my display tank, was to remove all z's and p's. Believe me, I will always dip and check for pests before introducing any new coral.
Happy reefing.