I got Salvador about a month ago. When I got him his fins were perfect except for one small hole in his bottom fin. He continued to be fine for about two weeks when all of a sudden one morning his fins were shredded; I think he had gotten fin rot, although I was surprised at how sudden it was. After a week of salt baths and daily Betta Fix, I did an almost complete water change as per the instructions. His fins were healing just fine. He continued to look fine until I got home from work today and now, he has three huge holes in his fins. The original hole, which never healed, is now bigger, plus he has a big hole in his tail and one on his top fin. It looks different than the fin rot I have seen before, but I'm not sure what else it could be? My long-lived previous betta never had holes like this. I'm worried because he has been doing so well but I don't want his poor fins to be in such bad shape! But I don't want to start him on another medicine regimen if that's not the problem, since personally I think the medicines can be stressful on them. He's a VERY active fish (when they put him in a cup at Petsmart, he jumped out!
) and his activity level/hunger hasn't decreased, so I don't think he's feeling bad.
Background/info: 5 gallon tank by himself, kept at 78 degrees with heater, filter, fed betta flakes and sometimes bloodworms, tank is fully cycled, I do 25% water changes weekly normally, did salt baths with 1 Tbsp salt/gallon for 15 minutes
I've attached some pictures where I tried to capture the holes; you can also see his recovering fin rot. Thanks for any thoughts/advice!