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I'm not sure where you are located. What is being fed will vary according to climate. I'm feeding high protein foods, but my pond is still not falling below 80F.... was exactly 80F at 7am this morning. In a cooler climate I'd be switching to a lower lipid (fats) content food.
The Tetra foods get knocked in the koi kichi circle. To get the price competitive, there are some shortcuts taken. But, the main shortcut is in the extruded pieces containing a lot of air. By volume, Tetra is not a good buy. By weight, it is a good buy. Personally, I think the Tetra foods are good ones for beginning hobbyists. The nutrition is certainly adequate. It sells rapidly so not much of an issue with it setting too long on a shelf. And, I think newbies tend to feed by volume, not weight of the food. As a result, they overfeed. The puffed air of the floating Tetra feeds offsets this tendency somewhat.
I don't go by the 5 minute rule. I let the fish tell me when they've had enough. This morning they consumed a cup of floating pellets in about 30 minutes before they were acting a bit too lazy for me to give them any more. I toss a few at a time in the pond. As long as the fish are acting eager to eat, I keep tossing a few at a time. Usually a cup of pellets is all my 15 get at one time. Sometimes its less. Their appetite varies. (Most are in the 22"-30" range.) I do not get the feeding frenzies other people get. But, I keep my fish well-fed and they have plenty of algae to graze all day long. Observe your koi and you will get to learn when they're just eating because it is there, not because they're hungry. I think the main thing, however, is to only feed what the fish will eat. If pellets are left floating along the edge uneaten, then they are being fed too much. There should never be uneaten food in the pond.
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