To maintain the health of your koi fish they need to be provided an appropriate sized living area with clean water and fed correctly. Following these simple guideline will help your koi to thrive.
The most important thing to consider when caring for a koi fish is water quality. Koi require water that is as clean as possible. In order to achieve ideal water quality, proper filtration is necessary. A filter system filters out the harmful properties in the water and returns the cleaned water to the pond. It is recommended that you test your koi's water every week or at least once monthly. You want to test for ammonia, nitrites, nitrates and pH. You want a nitrite level of 0 ppm with a maximum level of 3 ppm. The nitrate level should be below 80 ppm with a maximum level of 200 ppm. Ideally you want the water pH to be between 7.2 and 7.6. An acceptable pH range is anywhere from 6.5 to 8.2. The proper monitoring of the water is crucial in the care for koi fish.
The next most important thing in the care of koi fish is proper nutrition. Koi fish will overeat if allowed to do so. When feeding your koi you only want to feed enough food that can be eaten in a few minutes. Food that is not eaten can contribute to dirty water for you fish. It is best to feed several small meals in a day than to only feed a large quantity of food once daily. Most koi owners feed a commercial koi food. Koi food is available in either a pellet or stick form. The pellet form is more popular in the United States and Asia while the sticks are more popular in Europe. When buying your koi food it is better to choose a smaller sized pellet rather than a larger size. Small koi can get cuts in their mouth from trying to eat food pieces that are too large. A food with 30% protein or higher is recommended for young fish while older fish need a food with less than 30% protein. Beside feeding commercial koi food, you can offer your koi fish fruit, shrimp, squid or fish on occasion.
One last thing you want to consider when taking care of koi fish is to make sure that your pond or tank is not overcrowded. Overcrowding can lead to unhealthy water quality and unhealthy fish.