My fish came up with a case of fin rot so the past week I've been doing a 50% everyday and one 100%. I realized it wasn't starting to look any better so today I did another 100% in his 1.5 gallon and added 1 1/2 teaspoon of aquarium salt. I added the normal amount of dechlorinator and floated him. When I released him he did his normal swimming around and checking everything out, but now hes just floating motionless and staring off into space instead of his usual swimming around. The temperature in his old water was 78 F but his new temperature is 86 F so maybe thats it? Or maybe its the aquarium salt?