1. the reason why fish are easy to die after changing water without dechlorination

is probably related to water. Generally, fish farming uses tap water, which contains a small amount of chlorine, which is harmful to fish. If there is no chlorine removal, fish will be affected and even die. In this case, the best way is to put the new water in the sun for a few days before changing the water, so that the chlorine inside volatilizes.

Although changing water can improve water quality, if too much water is changed, the new water will also stimulate the fish, leading to some stress reactions. Therefore, in the daily water exchange, the maximum amount of water exchange should not exceed one third of the total amount, if it exceeds, it will be dangerous.

3. Frequent water

changes are not good except for large water changes. Frequent water changes are not good either. The reason is the same as large water changes. Frequent water changes will cause fish discomfort. Therefore, the water change cycle must be strictly controlled, usually about five to seven days, if the fish tank is relatively small, the water quality is not good to maintain, it can also be shortened to three days, but do not change water every day.

4. Be careful when changing

water for fish by violence, because when new water and old water are mixed together, there will still be some fluctuations. When changing, it is better to pump out the old water first, and then add the new water slowly from the wall of the tank. If the water is changed violently, it will also cause the stress reaction of the fish, and even cause the fish to die.