It is recommended to wait for 30 minutes to 1 hour after feeding the koi fish before changing the water. This can ensure that the koi fish have enough time to digest the food and avoid water pollution problems caused by undigested food. Besides, the amount of water replaced at one time should not exceed 25% of the total amount of water in the fish tank to avoid having an impact on the health of the koi fish.
The correct steps for changing the water include: preparing water with a temperature close to that of the fish tank and avoiding using tap water containing chlorine; using tools to clean the dirt at the bottom of the fish tank; gradually replacing the water in the fish tank and adding water treatment agents to help maintain the water quality balance. Through these steps, the living environment of the koi fish can be ensured to remain healthy and stable.