I don't advocate you do this, I only offer this for what its worth.
I've had zoas that just act pissy. They don't open up, as if they are pouting. Nearly all my zoas were bought at frag swaps, most from a local zoa specialist.
Once I complained about pissy zoas, she gave me this procedure that I now call "ZoaGirl's Attitude Adjustment Dip". It has worked for me several times, even when zoas
looked like they were starting to melt.
Dip the zoas in a container of tank water and Revive for 5-10 minutes. Swish, swish, swish (look for small amphipods to fall off, sometimes they will get between polyps and irritate zoas).
Then dip them in fresh (RO) water that is temp and ph adjusted (a pinch of baking soda does well) to match your tank water for 5-10 munutes. Swish, swish swish.
I'm not sure what this does, except get rid of amphipods if any, but it sure gets the zoas' attention.
Otherwise, do what GeoJ said, leave them alone.