I got my betta from local pet shop many months ago, problem was as soon as I bought him he started to lose his fin. Here's the sequence of event how he started losing his fins,
1) Few weeks after I got him, I realized his fin was going away, problem was because of artificial plants I had in aquarium, so I removed every single one of them and just left him with one single ornament.
2) Few weeks after that, I got a tetra to live with him, for the first few weeks they got along just fine. But I noticed gradually that his fin was going away very fast, but could not figure out why that was happening. So I started using melafix to see if it would help him grow his fin back up.
3) Few weeks after without any success, I realized the tetra was the culprit of the fin-rot, so I removed him and had him placed on the other smaller aquarium I had. Then I started treat him by just adding aquarium salts in his water tank.
4) For few months I think his fin was regenerating back steadily, but the regeneration stopped and he started to lose the fin again, desperate, I started treating him with bunch of different things (not all at once, but each of them with specific prescribed periods given) I tried using anti-bacteria, fungus, parasite but nothing really has worked at all.
Currently the oddest thing about his fin rot is that the edge of his fins are very smooth, there doesn't seem to be any visible fungus-patches as well. I'm really baffled, it's been many months since he started losing his fins, it's not even stopping and it's still going way. Physically and mentally he is very active and healthy, it's just that his fins are going away and I tried everything to stop it. Most of his fins are gone and I'm really deseprate about him, can you guys help me?