Zoas doesn't require magic or tricks. They are quite hardy. So long as your parameters and lightings are good and there isn't any pest eating them, they should be ok.
Do post some pics and more information.
You'll be surprised. I had a brain that tried to eat a clown tang which died and landed on it. When I saw it, the brain had already got the head of the fish into its mouth.
Can't find it anymore. Only managed to see it twice. Was tempted to catch it, but didn't think I can, so left it to fend for itself. The last time I saw it, it was hiding between 2 brains, hopefully, it didn't become brain food....
I have 3 dottybacks in the tank now. Bought 2 of the oblique, one with a dot on the top fin and one without. The one with the dot is probably dead, cos I only saw it once or twice and it always hiding and the fins are kinda broken. Most likely bulllied by the neon dottyback.
Think that's enough dottybacks.
I had one of those before. But I was lucky cos, it moved to a rock which was easily removed at the top of the rock scape, and I spotted it. Rock was removed with the crab inside. hehehe
I knew a reefer who had a crab that moved quite a few of his priced zoas to the back of the tank. Kinda like trying to decorate its cave.