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my star polyps took 3-4 days to fully expand. they seem to be really sensitive to change but are pretty hardy. just give them a little time. they usually look a little ratty til they get settled in.
not 100% positive but i think so. You're tank is deeper than mine but i have the same lighting as you. I might place them a little higher in your tank...say half way up. i think they would do fine.