That debris is not one feeding. It's particles that have accumulated over the last week or so, when I was feeding them the shrimp.

The fish eat the small amount of flake food I give them.

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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.