Follow all directions provided with the water conditioner, and use the exact amount required for your tank or bowl size.

Alternatively, you can mix hot and cold water from your tap until it is the same temperature as the water in your betta’s current container. [3] X Research source If you follow this method, use an aquarium thermometer to make sure that the water in both tanks is the same temperature, and add water conditioner to the new water as instructed.

To be precise, you can measure the water as you take it out. For instance, if you have a twenty-gallon tank, remove up to ten gallons measured using jugs or other measuring containers. You can also use a siphon hose to transfer water from your betta’s container to a bucket or sink. Once the water starts flowing, move the hose so it “vacuums” the gravel at the bottom of the tank, picking up fish waste, old food, and other debris.

Follow all directions provided with the water conditioner, and use the exact amount required for your tank or bowl size.

Alternatively, you can mix hot and cold water from your tap until it is the same temperature as the water in your betta’s current container. [16] X Research source If you follow this method, use an aquarium thermometer to make sure that the water in both tanks is the same temperature, and add water conditioner to the new water as instructed.