Here are the steps for changing water in a betta fish tank:
Preparation Phase
Gather tools and supplies:
A clean bucket or container
Water conditioner (if needed)
Thermometer
Siphon or water pump for draining
Dechlorinator (if your tap water contains chlorine)
Treat and let water sit:
Fill a container with tap water in advance and let it sit for 2–3 days to allow chlorine to evaporate. Alternatively, use a water stabilizer to remove chlorine quickly.
Water Change Steps
Turn off the filtration system:
Before starting, turn off the tank’s filter to prevent water flow from disrupting the process.
Check water temperature:
Use a thermometer to measure the tank’s water temperature. Ensure the new water is close to this temperature.
Remove old water:
Gently siphon or pump out old water from the bottom of the tank, being careful not to disturb or suck up the betta. Remove no more than 30% of the total water volume.
Add new water:
Pour the pre-treated new water into your clean bucket or container, and add the appropriate amount of water conditioner (if required).
Slowly pour the new water into the tank, ideally along the tank walls, to avoid directly rushing it onto the betta.
Let temperatures equalize:
After adding the new water, wait 15–30 minutes to let the temperature of the new and old water balance out.
Restart the filtration system:
Once the tank is refilled and temperatures are balanced, turn the filter back on to help the new and old water mix thoroughly.
Important Notes
Temperature control: The new water should match the tank’s temperature as closely as possible to avoid shocking the fish.
Water volume: Never replace more than 30% of the tank’s total water at once, as this can stress the fish.
Monitor your betta: After the water change, observe your betta’s behavior and health. If you notice anything unusual, take action promptly.
Frequency: The water change schedule depends on tank size, number of fish, and water quality. Generally, a partial water change once a week is recommended.
Following these steps will help keep your betta in a healthy, stable aquatic environment. For any questions or special situations, consult an aquarium expert or staff at your local pet store.