Have you tried moving it to another location in the tank? I actually compare zoas more to SPS in behaviour than I do other soft corals. Yes, some zoos will grow damn near anywhere but others are super picky about lighting and flow. I have a some zoas that hate the high flow and light of my tank and had to move them accordingly. I have others than literally need to be next to my SPS to open up and be happy.
Some zoas really don't like being moved to another tank (another SPS quality). They'll close up for a few days to weeks until they feel safe again. Like mentioned before: if they're not melting away, just wait. But do consider where you have them placed. They might not be in an ideal location.
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