Yes- they are fat! Feeding once a day is enough, or sprinkle a Little bit twice a day. The bigger the tank, the bigger they will get. They need at least 6 gallons of water per fish and good filtration. I have a natural 1 acre pond next to a lake. People used goldfish as bait in the 40's and 50's, and the leftover bait was dumped into the pond and lake. The goldfish are a foot and more in length, and I've never fed them. They live on pond weeds, esp duckweed- a real pest. I have bullheads (catfish) that come over to be fed, but the goldfish are aloof. They are spectacular when they jump out of the water catching dragonflies, and are welcome to all the mosquito larvae they can eat. I do have occasional Kingfishers, Osprey, Herons, and even a bald eagle poaching fish.