Mine do the same thing as reefshadow's, they will close up after the lights go out, but during the night they will kinda re-open (not fully) and pulse...
As for your flow question IME they are not real picky. I have some in pretty high flow and I also have some that hardly get any flow I dont have a problem with either.
I've tried putting them in a few different spots. Right now they are in a higher flow area and they are not pulsing. I plan to try to move them to a quieter corner to see if they will start back up.
Mine also continues to pulse throughout the night after a brief period of retraction when the lights go out. I like to place it in a low to medium flow because I like to see it pulsing. I can't appreciate the pulsing in high flow but it seems to do alright there as well.
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