Zoas not opening

Could be dozens of reasons:

A new fish or an established fish nipping

Lighting schedule changed or the overall Kelvin of your lights have shifted colors

A hairy legged crab has developed in your tank and its irritating them in the middle of the night

Have you done a Phosphate test? Some LFS will do a 1time test for free

Any change in water flow? Too much flow is the leading cause of Zoas melting away... they get p.o.'ed and shrivel up and melt away.

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