I acquired a female betta today who had holes in her fins. I initially thought it was ammonia poisoning, but further research has given me doubts (some sites have said that could be a form of fin rot) so now I'm unsure what to do.
I've kept her in her cup for now though I do have a tank for when she's well and I can move her to it if that's better. I did a full water change with distilled water on her cup and added aquasafe. (I realize now a full water change maybe wasn't the best idea. >.>). She seems perky and not lethargic and doesn't seem to have any other problems, though the area around her gills is red (I can't tell if this is her natural coloring or not though).
Also, my oldest lad has a rip in his tail I just noticed today. It seems very clean and it's roughly in the middle of his tail. My guess is he somehow caught it on something because his tail is very, very long. He's in a tank that's about a gallon and I was thinking maybe he'd do better in a smaller place with softer plants (he doesn't swim as well anymore. His tail drags him down a lot due to its length), but I think he would be upset with a smaller domain. Regardless, I'll be replacing his plants with silk ones when I can, but is there anything I can do in the meantime for the rip in his tail?