Betta fish can be kept in tap water, but the water must undergo proper treatment to ensure safety. Below are the key points:
1. Essential Treatment for Tap Water Use
Dechlorination
Let the tap water sit still for 2-3 days (or expose it to direct sunlight for 1-2 days) to allow chlorine to evaporate.
In emergency situations, a water conditioner can be used to remove chlorine quickly.
Water Temperature Adjustment
When changing the water, the temperature difference between the new and old water must be ≤ 2°C to avoid stressing the betta fish due to excessive temperature variation.
2. Situations Where Direct Use Is Not Recommended
Boiled Cooled Water: Boiling water at high temperatures reduces minerals and fails to completely remove residual chlorine. Long-term use may harm the health of betta fish.
Untreated Tap Water: Direct use can lead to chlorine poisoning, gill damage, or even death of the betta fish.
3. Recommendations for Alternative Water Sources
Purified Water: It can be used directly, but it is relatively costly and lacks minerals. Trace elements need to be added regularly.
River/Lake Water: It must be confirmed free of pollution and filtered before use.
4. Standardized Water Change Procedures
The amount of water changed should not exceed 1/3 of the total water volume in the fish tank.
Avoid letting the water flow directly hit the betta fish during water changes; it is recommended to pour the new water slowly along the tank wall.