Performing regular water changes is essential for maintaining a healthy aquarium environment. Here's a step-by-step guide on how to properly change the water in your aquarium:

Materials Needed

- A clean bucket or container dedicated to aquarium use

- A siphon or gravel vacuum

- Water conditioner or dechlorinator (if using tap water)

- A thermometer (optional)

- A towel or paper towels (for cleanup)

Step 1: Gather Your Materials

Ensure you have all the necessary materials within easy reach before you start the water change process.

Step 2: Turn Off Equipment

Before you begin, turn off any equipment in the aquarium, such as filters, heaters, and lights. This prevents any damage to the equipment and ensures the safety of your aquatic inhabitants during the water change.

Step 3: Measure Water Temperature (Optional)

Using a thermometer, check the temperature of the new water you plan to add to the aquarium. It should match the current water temperature in your tank to avoid stressing your fish.

Step 4: Siphon Gravel

Using a siphon or gravel vacuum, start by removing debris and waste from the substrate (gravel or sand) in your aquarium. Insert the siphon into the substrate and allow it to remove water while gently stirring the substrate to release any trapped debris. Be careful not to disrupt the substrate too much, as it can disturb beneficial bacteria.

Step 5: Remove Old Water

Using the siphon, drain a portion of the old water from the aquarium into a clean bucket or container. Typically, you should replace about 10-25% of the aquarium water during a water change, depending on your tank's specific needs.

Step 6: Add New Water

Slowly add the new, conditioned water to the aquarium. You can use a clean hose, pitcher, or a separate container to pour the water gently back into the tank. If using tap water, make sure to add an appropriate amount of water conditioner or dechlorinator to remove harmful chlorine or chloramines.

Step 7: Reconnect Equipment

After adding the new water, reconnect any equipment you turned off earlier, such as filters, heaters, and lights.

Step 8: Monitor Water Parameters

Keep an eye on your aquarium for the next few hours to ensure that the water temperature stabilizes and that there are no immediate issues with your fish or plants. Check the water parameters (pH, ammonia, nitrite, and nitrate) to ensure they remain within appropriate ranges.

Step 9: Dispose of Old Water

Dispose of the old aquarium water responsibly. You can use it for outdoor plants or gardens as it contains beneficial nutrients.

Step 10: Clean Up

Clean any spills or drips around the aquarium with a towel or paper towels to prevent water damage or slipping hazards.

Step 11: Record and Maintain a Schedule

Keep a record of your water changes, noting the date, the percentage of water changed, and any observations about your tank's condition. Establish a regular schedule for water changes to maintain a healthy aquatic environment.


Regular water changes are essential for the well-being of your aquarium's inhabitants, helping to remove toxins, replenish essential minerals, and maintain water quality. By following these steps and maintaining a consistent schedule, you can ensure a thriving and vibrant aquarium ecosystem.