The Nine Major Pitfalls in Koi Keeping: A Guide for Beginners to Avoid Trouble

Experienced koi keepers share that the following nine pitfalls should never be touched. Without further ado, let’s dive straight into the valuable information.

First: Avoid Mixing with Aggressive Fish

Koi have a gentle temperament and it is not recommended to mix them with aggressive fish. Additionally, mixing them with goldfish is also not advisable, as the koi are the ones likely to get injured.

Second: Be Mindful of Aquarium Landscaping

Many fish enthusiasts wish to create a beautiful living environment for koi, thus placing artificial mountains and Taihang stones in the aquarium. However, the result is that the koi’s body surface gets scratched by the stones.

Third: Desperate for Cure is Not Advisable

When koi get sick, some people use medication indiscriminately, even treating salt as a universal fish medicine, grabbing a handful at the slightest problem. It is crucial to treat fish diseases with the right medication. Generally, problems can be solved through the “Three Basic Fish Care Practices.” Prevention is always better than any miraculous cure.

Fourth: Control the Number of Fish

Fish keepers often have a habit: they cannot resist buying home any fish they like. However, if the density of fish is not controlled, and the individual’s fish-keeping skills are not mature enough, and the equipment conditions are also not ideal, it will lead to a series of problems. Therefore, it is suggested that fish enthusiasts in a position to do so should keep two to three fish per ton of water in the fish pond.

Fifth: Avoid Hasty Attitudes

There is no habit of acclimating water. As soon as koi are purchased, they are eagerly placed in tanks or ponds. Typically, beginners mistakenly believe that tap water is fine after a few days of circulation in the tank. However, they are unaware that it is necessary to cultivate nitrifying bacteria before placing the fish. If there are existing fish in the tank, new fish also need to be quarantined to avoid cross-infection.

Sixth: Control Feeding Frequency

There is a type of hunger called “Grandma Thinks You’re Hungry.” Many koi enthusiasts, out of love for koi, worry that the koi will not be full and subconsciously want to feed them whenever they see the fish. This can lead to the death of koi over time. Because koi do not have the concept of fullness and will keep eating as long as there is food.

Seventh: Avoid Over-Diligence

A good filtration system is crucial for raising koi. Nitrifying bacteria in the filter media are the main guarantee for the health of koi. However, if filter media are changed too frequently, or if they are cleaned too thoroughly, it will have a negative impact on the health of koi. This can destroy the hard-established nitrification system.

Eighth: Avoid Over-Laziness

Some people believe that the filtration system is very powerful, so they only change the water once every one or two months. Not changing the water for a long time can lead to excessive ammonia nitrogen in the water, causing problems for koi.

Ninth: Avoid Ignoring Water Temperature Changes

Koi have strong tolerance and are not prone to illness. Although koi can adapt to a wide range of water temperatures, they are very sensitive to sudden changes in water temperature. If the water temperature suddenly changes by more than five degrees, it is very likely to cause death. Therefore, while getting started with koi is relatively simple, truly raising them well is not easy.

I believe that everyone has encountered these pitfalls more or less when they first started keeping koi.