It's more than likely an internal bacterial infection salt won't have much of an effect it won't hurt as it will help with Gill function and add essential electrolytes I always add some salt when treating sick he how I dose maracyn in food add 1 quarter of a packet of maracyn one scoop of focus 1 table spoon of pellets 1 cap garlic guard a few drops of water feed for 7 days store any leftover food in the fridge you don't have to use the focus it just binds more of the medication to the food @Danabana