Zoas disappearing

[jay2x]

This are the livestock I have:

Pistol Shrimp

2x peppermint shrimp

2x cleaner shrimp

3 clowns

1 Urchin

Anemones

Some Hermits

I don't know who's been eating them, or maybe they are falling off and gets buried in the sand. I'm not sure what's going on, I haven't caught anyone munching on the zoas. I do feed these guys twice a day.