Koi Fish Feeding Habits
Koi will eat all types of food. Live, frozen, freeze-dried, and prepared foods will be devoured without hesitation. Make sure to include plenty of plant material in their diet. Most prepared koi foods include plant material, but occasionally feeding spirulina flakes, wheat germ pellets, or even chopped, frozen spinach would be a good idea.
Compatibility with Other Fish
Koi are generally peaceful. They may, however, pick on slow moving fish such as fancy goldfish. Since they are cool water fish, they generally should not be housed in an aquarium with Tropical Fish.
Koi Fish Overwintering tips
Koi can be overwintered in the pond in most areas of the country if the water is at least 3 feet deep. They are not as cold tolerant as the goldfish, so keeping them indoors would be advised in very cold climates. Koi can be kept in a large aquarium set-up in a cool basement or garage until the spring, then returned to the pond.