Discus are not scaleless fish and not salt sensitive within reasonable amounts. In fact salt & salt dips are a preferred choice of medicating before actual meds. But I do agree regular salt will do nothing for bloat; you need epsom salt for that.
Thanks, I did the water change, About 50%. The bloating has completely gone and he/she is back to it's self and colors even though I didn't add epsom salt

Do you disolve your cubes before putting in the tank? The pieces are much smaller. Also, I feed my discus 3-4 times a day at minimum. Beefheart, bloodworms, flake and pellet. I always pre-soak the pellets in water then pour in tank. It's easier for the discus to digest.
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I let them go very soft before adding the cube, I never add them even partly frozen, I'll start lessening the feed. Thanks.