Once a day is plenty for fish like that. On top of the floating flakes which should all be eaten within 30sec or so and not left floating....pinch 3-4 flakes and dip your fingers in the water so the flakes drop to the bottom. This should feed your cory.

For fish like Discus with high metabolism, they require smaller feedings more frequently....3-4 times daily depending on their size.

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--->Pictures of my 75g Amazon tank<----