Mostly all my sps have the most polyp extension during the day and only retract a bit after lights out. I don't do anything special. I do have some acros though that seem to have little polyp extension in the day and more at night but that doesn't seem to be the norm.
I know that doesn't help really but just an observation. Stuff like Millie's seem to have fully extended polyps all the time as do my gorgonians and I guess even zoos.
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