There are a lot of koi food vendors to choose from. Each providing their own unique prespective as to how you can make your fish grow bigger and heathier. Take the time to look around our website and choose the right koi food for your fish. If you live in a colder climate, choose the ceral based koi food. Avoid high protein koi food for your fish if the water temperature is below 55 degrees fahrenheit or about 13 degrees Celsius.