Replacing fish tank water directly with tap water can have serious health effects on the fish. Tap water often contains chemicals such as chlorine and chloramines, which are harmful to fish in high concentrations. Chlorine destroys the beneficial bacteria in the tank, which are essential for fish survival because they can break down waste and maintain water balance.
If you want to use tap water to replace your fish tank water, you'll need to use a water treatment agent to neutralize or remove chlorine and other harmful chemicals. These treatments can be purchased at pet stores or fish supply stores.
Adjust the water temperature: Make sure that the tap water you add is close to the water temperature in the tank to avoid the temperature difference causing stress to the fish.
Add water slowly: Don't change all the water at once, as this will slow down changes in the concentration of chemicals in the water and reduce the impact on the fish. It is possible to change a portion of the water in the fish tank one at a time, such as 20 to 30 percent, and then wait for a period of time before making the next change.
Monitor water quality: Regularly monitor the water quality of the fish tank using water quality testing tools to ensure that parameters such as pH, ammonia, nitrite and nitrate are within safe limits.
Replace the filter media regularly: The filter media in the fish tank filter can trap waste and harmful substances. Replace the filter media regularly to keep the filter running efficiently.
Avoid overfeeding: Feed only what the fish can eat in 2-3 minutes. Overfeeding can lead to an increase in residual food at the bottom, which can increase the burden on water quality.
Monitor your fish's behavior and health regularly: Observe your fish's swimming and appetite, if there are unusual behaviors or symptoms, this could be a sign of a water quality problem.
Maintain a steady water temperature and light exposure: Most fish need a stable water temperature and light cycle. Use a heater to maintain the water temperature and ensure that the tank is not exposed to direct sunlight.
Regular partial water changes: Partial water changes are done every one to two weeks to keep the water quality stable. Avoid changing a large amount of water at once, as this can disrupt the ecological balance inside the tank.
Avoid the use of chemicals: Avoid using chemicals to treat water quality issues unless there is a special need. Relying on chemicals can damage the beneficial bacteria in the fish tank and affect the ecological balance.