After feeding all my fish, I've noticed that my yellow koi has become fatter than it was before and I'm curious to know if its either "pregnant" or its somehow has some problems. I don't see anything wrong with it though. It swims fine and eats justs like the rest of mine do. I feed them twice a day and the food is Goldfish Flakes and Tetra PondFood Color Sticks. I also give them bugs to eat like flies sometimes and they love them.