So my Jardini was still having issues with biting his tail. One change I tried was holding off on water changes. I usually change 50% weekly. He was showing improvement so I held off on the water changes. I waited 2 1/2 weeks and his tail was looking much better, and he was leaving it alone. This morning I did a 50% water change and he is back at it. Nitrates after water change are at 30ppm. Maybe he just gets stressed from the water change I just don't know at this point.