dont do anything. keep them right side up and wait. I've had zoas that have turned over as well as other mishaps take 3-6 months to recover but they always do. freshwater dipping is not going to do anything. If you want to dip do it in tank water and lugols or other coral dipping solution (probably wont do anything besides kill any fauna hiding in there but wont hurt anything like a FW dip might). I'd just stick the zoas in front of a powerhead and let blow off what comes off and wait it out for recovery.