That's what I thought. but I have come across forums stating to feed them several times a day even ! . i introduced five new fish yesterday but we have a shubunkin that is Maybe 5 to 6 inches which is older and is bulling the others and is eating alot of the food and even chasing other fish away from it ( it has been in the pond longer). From the info you have given I may cut back on feeding as we also have an algae problem. As regards the size of the pond I would have to do the maths, as its a long story about me looking after it.