The core method of changing water for betta fish is: change 1/3 to 1/2 of the water volume each time, keep the water temperature stable and avoid stress reactions. The following are the specific steps and precautions:
I. Water Changing Steps
Prepare New Water
Let tap water stand for 1-2 days in advance to remove chlorine, or use a water conditioner for treatment. Ensure that the temperature of the new water is the same as that in the original fish tank.
Clean the Old Water and Fish Feces
Use a straw to suck out the feces and residues at the bottom. Pour out about 1/3 to 1/2 of the old water, and retain part of the original water to maintain the balance of the nitrification system.
Slowly Inject New Water
Pour the new water slowly along the wall of the fish tank to avoid the water flow impacting the fish body or stirring the bottom sand, so as to prevent the betta fish from being frightened.
Put the Betta Fish Back
Gently scoop up the betta fish with a deep net bag to avoid scratching the fish fins. Be gentle during the operation to reduce stress.
II. Suggestions on Water Changing Frequency
Small Fish Tank (1-5 liters): Change 25%-30% of the water volume every 2-3 days.
Medium-sized Fish Tank (5-20 liters, with a filter): Change 20%-30% of the water volume every week.
Large Fish Tank (more than 20 liters): Change 20%-30% of the water volume every 1-2 weeks.
III. Key Precautions
Avoid Changing All the Water: Changing more than 50% of the water at one time will cause drastic fluctuations in water quality and damage the nitrification system.
Water Temperature Consistency: The temperature difference between the new and old water should be controlled within ±1℃. A thermometer can be used to assist in monitoring.
Reduce Stress: When scooping up the fish, a transparent container can be used to temporarily isolate the betta fish to avoid damage caused by direct contact with the net.