Many times scorps can fight off injuries and mild infections on their own without intervention. Here's the caveat, water quality must be near perfect and optimally they would get a live diet, primarily fish. Guppies or appropriately sized mollies, gut loaded ghost shrimp with a high vitamin c food could also be included. If you are feeding dead foods, stuff with high vitamin c pellets, Hikari makes a good one. Dead foods must include a fatty fish like salmon and be low in thiaminese, so no krill.
I mostly feed frozen human grade shrimp. Due to geographical location live food is hard to obtain, but I will absolutely feed live when I can. I can see what our local Walmart has as far as dead options.