Zoa totally disappeared?

[k1ngofthrones]

I got a small rock that had a teeny zoa frag on it along with a feather duster and what seems like an aiptasia. The last few days I have been renovating my room a bit so I have not been paying much attention to my tank besides maintenance and feeding. However, today I noticed my zoa is totally gone with not a single trace of it left. The only inhabitants in my tank are a clown, chromis, scooter blenny, coral banded shrimp, scarlet hermit, and emerald crab. I figure it might be my emerald, but he has left the coral alone, the only time he’s been near any of my frags was when he was munching on a spaghetti worm that settled underneath one, but that’s on the opposite side of the tank where my zoa was. What could have happened?

 

[ndrwater]

Zoas can and do "melt" from time to time. I wouldn't necessarily blame any of the inverts unless the zoa was already on its way out.