Well something is eating my zoas as far as I can tell it is the astreia(spelling?) starfish, I've been watching the last couple of days and I'm no expert but these starfish seem to be just sitting on top of my zoas until the disappear. I've looked for other culprits a but can't find any. So I started the manual removal of these guys, within 5 minutes tonight I pulled out 30 wow that's alot maybe it's just a huge population and the next food source is the zoas!?