I forgot to turn off a NO strip light which has one 20w MarineGlow actinic blue on the 40 gallon tank. After two hours with that very dim blue light, all the zoas were still fully open despite all the other coral were closed. Interesting.
MY zoas and paly's will close sometimes right after I turn all the lights out... but if I check on the tank in the middle of the night some of them are usually open. Its very rare that I don't have some of them open all of the time.. If that makes sense.
