I wouldn't worry. Feed it a little to make sure it can recover. That side was obviously damaged before you got it, and now it is showing it. If there is continued recession, post parameters to see if something else could be wrong.
tahnks for all of your replies, I actually feed them about twice to three times a week and all of the polyps (including the two tiny ones that are starting to grow over the dead spots) extend their feeding tentacles and take in a decent amount of mysis shrimp. I've had it for at least a month and it has always swelled very healthily so it just caught me off guard.
I had the same problem with my acan when I got it. It seems to be caused by undigested food in my opinion (It ingested the food for couple days but food was still inside rotten). I blasted the sick polyps with a turkey blaster and all food I fed was still inside. So I remove the sick polyp with a paring knife (not fragging) to prevent detritus accumulation. The colony is ok now.
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