I have had an ongoing problem for several months not with my VT male, Marlin. I have posted several threads and tried several solutions to no avail. I keep him in 2.5 gallon tank at 78F with a grated top. The water gets changed 2-3 times a week: 100% once a week, 50% the other times.
His tail started off frayed then heals pretty well (you can see a see-through tail starting to rebuild) but then in a week he'll be right back at square one. At first I thought it was water conditions so I have been using Melafix and API stress coat. Then I thought it was decor, but he ONLY has a silk plant (and a heater) in his tank at the moment. I think originally he may have ripped a fin on a plastic plant I had, but I don't know why it's not healing after I have taken it out.
I am really at a loss. I didn't think tail biting caused fins to become frayed (I thought it only took whole chunks out). Could this be the problem? If so, I don't know why he'd be biting, because he seems happy (eats, builds bubble nests, etc). Sometimes the fins look red (as they do in the picture, but most of the time they do not)
What should I do? Should I use AQ salt? Should I keep using Melafix and stress coat? Could pH or water hardness be the cause?
ANY help is appreciated, thank you.