Ushally comes from crowded/small tanks you see it a lot with red tail catfish. There was a video on here on mfk with a red tail cat that had a very bad case of Gill curl so what he did was he used colive oil to make the cat "sleepy" and lytrilly took surgen scissors and cut the infected Gill curl area and then quarantined him for 2weeks. If you do it though make sure you use a VERY small amount of the colive oil and hold the fish with a towel and use another towel with to cover his eyes. Try to get someone to help you with it. Its not very hard at all the cat did great after and got around 3 and half feet which is around a small adult size for a rtc. Its not hard at all you just have to have the balls to do it.
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Sent from my LG-P925 using MonsterAquariaNetwork App