Some of mine stay open all night as well, but in total darkness they often close. Also I have noticed that when they start to feel bad, they only open when a stronger light is on. This is a sure sign for me that they are in decline and need attention, usualy a peroxyde dip.
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Originally Posted by reefwars
most of my zoas and palys stay open all night or open and close throughout the night and they arent getting much out of photosynthesis from my moonlights.
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