Coral polyps appear and disappear regularly during the course of the day/week or hour. That's normal, ESPECIALLY when the coral is new to your system. Relax, enjoy the coral. Next time you are feeding, feed the fish heavily first, then squirt a small portion unto the coral's polyps. Watch what happens over the next few days. All corals benefit from occasional feeding of the "right stuff" especially non photosynthetic corals. My bet is that the coral responds favorably to feeding. Be careful not to over do it.
Most new reefers look at their whole aquarium instead of paying close attention to each individual critter. Your critters will tell you how they're doing by behavior. Learn the behavior of healthy individual critters and you will advance along the continuum of education in AQUARIOLOGY.
Most of you have never heard that word before. That's reefing education 101. Tought in the University of Hard Knocks. My alma mater. Research, study, learn, put into practice, observe, fail, try again, observe and get it right. AQUARIOLOGY, become a part of it and achieve greater success!
Dick
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