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My betta has a mild case of fin rot so I put him in a 1 Gallon hospital tank with some aquarium salt changing the water daily for a week. He looked like he was getting better so I moved him back into he normal 4 Gallon tank. It’s been another week and it seems his fin rot is coming back, is it to early to put him back into the little tank with aquarium salt? Will it hurt him in anyway??