This naso has been in my aquarium for about a year now, today he is listing, with labored swimming and bloated. Any ideas? All of these fish were quarantined, 28+ days therapeutic copper, prazi and FW baths, some had broad spectrum antibiotics and/or medicated foods, some didn't. All fish are very healthy, daily diets consist of full sheet of nori, reef nutrition pellets, PE mysids and LRS reef frenzy. Occasionally enriched brine, Rods fish eggs, calanus, etc. Water chemistries are very good. There are a lot of tangs in the tank, but never seen any aggression towards the naso, and no signs of being picked on or heavy breathing. Still eating as of now. Thanks.