I have a 20" rtcxtsn with gill curl on one side. I've had it since it was only a few inches and was raised in a 500g outdoor pond. One winter it got a little too cold over night (I'm in sw FL) and I had to move every fish out the next morning to my tank inside. After all this happened I noticed that the rtcxtsn had developed gill curl on one side. It's now been almost 2 years and he has been moved to an 800g pond and it has not gotten any better. Is this harmful to him at all? I've heard about trimming the gill to fix this but would rather not do that if it's not necessary.
Sorry for the blurry photo, he wouldn't stop moving around lol.

Sorry for the blurry photo, he wouldn't stop moving around lol.
