No hold on epsom. Darting/rubbing with raised scales usually means something like skin flukes.
Keep him in aq salt until you buy those medications that Sena wrote.
Use extra Stress Coat even with the meds. Anything to help them with the slime coat which is a fish's only protection against disease. When you use extra stress coat fish will produce extra slime and help to fight parasites
So until you buy those meds keep him in aq salt , raised temp,dark, daily water changes with 2tsp of aq salt