No, I never put my hands in the tank if they're contaminated with lotion or hand cleaner.

This condition only happens when I feed the fish which is why I think the problem is with the new food I bought. The tank is clean again so, I'll keep an eye on it and try another fish food brand.

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30 gallon glass aquarium, GLO dual fluorescent light bar with one 24 watt Powerglo light and one 24 watt Marineglo light, Fluval 205 canister filter pump and two Discus fish.