Just keep ur water clean & add a lil salt as usually. U can add melafix if u want too.
Ur aro looks a lil skinny. Fatten it up
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most important is clear water - clean filters fully bio'd up & good food the fish will heal it's self if it is livining in the right condition's
Some medication that may be effective Potassium Permanganate make sure you read the instructions very carefully before using. or you can also use Furan 2
those are the meds i have used in the past on very sick fish. theses med will affect the BB in your tank .