YOU SHOULD FEED THEM AS MUCH FOOD AS THE WILL CONSUME IN 5 MINUTES ONCE A DAY. AND A SECOND SMALLER FEEDING LATER IN THE DAY IF DESIRED. THERE IS NO FORMULA PER POUND BECAUSE OF ALL THE VARIABLES,TEMP.,WATER QUALITY ETC. IF THERE IS FOOD AFTER 5-MINUTES USE LESS THE NEXT DAY. THIS IS VERY IMPORTANT. USE ONLY A HIGH QUALITY FOOD LIKE HIKARI. YOU WILL FEED LESS,THE FISH GET MORE QUALITY FOOD THATS DIGESTIBLE AND LESS WASTE IN THE WATER. CORN AS A FIRST INGREDIENT SHOULD BE AVOIDED(FIRST 3 REALLY). CORN IS NOT DIGESTED BY KOI,ITS JUST A BINDER. OLD FISH FARMER