slits in my betta's fin are severe, so here is how it happens: i do water changes one night, then the next morning, my betta has slits in his bottom fin, in between bones. then, shortly after, what comes next? fin rot. i just don't get it. help!
are you using tap water with no conditioner? Ripped fins are usually a sign of poor water quality. Or maybe he's just flaring too profusely. It's happened before. You can take a cup of your tank water to petco and they will test it for you.