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The zoa's could be producing mucous due to irritation from the water change or from cleaning off the rocks. Could also be vermetid snails on the rock underneath the zoas releasing mucous to catch the debris that was pushed into the water column from the water change or from cleaning off the rocks.
It’s only on the zoas, and little bit on the rock in no light areasI think you have the start of a bacterial bloom maybe? I had a topless nano tank that would get this stringy snotty white stuff REALLY bad if any sort of aerosol cleaner was sprayed within ~15 feet of the tank. It looked basically identical to what you have (especially the first pic), although mine was much worse.
I manually removed what I could and used a cheap UV sterilizer in the back compartment of the tank and it slowly went away. Is it only on the zoas or is it also on the rocks around the zoas?