I drop NLS pellets in my brothers tank for his loaches. They are scavengers.
My brother had a Molly die and disappear in that tank. The loaches cleaned the carcass right up... He feeds them wardly flakes so I'm sure they needed the meat. I can't believe they've lived five years in his care.
They are more active and hide less since I've been caring for them. I don't know what cories eat, but loaches need a meat based diet.