Zoas and crabs / snails

So we just purchased a few new frags of some beautiful zoas last night - we also got some red legged hermit crabs as well as some margarita snails.  Adjusted all of them to our tank and placed them in last night.  When I woke up this morning I was dismayed to find a few chunks gone from a few of our zoa frags and the invertebrates happily munching away on our rock / sand.  My question is - should I not have the crabs / snails in the tank with the new zoa frags?   Are the zoa frags going to fall victim to the cleaners I got to help with the algae growth?  

So strange, I've never had that problem. But get those culprits out, send them back and get some black legged crabs. Your snails should be fine. 

So I thought I'd share what the zoas LOOKED like last night in the tank and what they look like now.  Maybe that will give you guys some more help in helping me get this issue resolved.  My husband said that they are crawling over them and onto the rock - it doesn't appear that they're actively eating them. 

It may have just been due to switching tanks. Do you see the heads in your tank at all? Sometimes zoas will come off the rocks and you can see them rolling in your substrate. They look good today, the spot almost looks like it never had zoas there it looks like where I had it glued to my rock.

My guess is the crabs or snails flipped it. Mine do it all the time.

The hermit crabs and snails won't eat your Zoa's but they may climb on them and clean them!