What I would do is add some Indian almond leaves as they have antibacterial and antifungal properties and I would treat with aquarium salt 1 table spoon for 2 gallons for just remember to only put back in what you take out so if you do a two gallon water change put 1 table spoon of salt back in the salt will help with the fin rot and treat any possible ich am not convinced your fish has ich give an update after a week if your seeing no improvement @KerrieBetta2