yellow polyps

[Bugsy]

Polyps are not doing well. Some are open and some seem to be just diappearing. I have looked for things eating them in the tank since its only 3 gal its easy to do. the only thing I see with lights on or off is lots and lots of copepods...

Everything else in the tank is doing well except these. My other zoas and paly's are all fine nothing bothering them. I read these are very easy to have in a tank but not so in my case.

Any advice as to what I can do before I loose them all..