The core method of changing water for betta fish is to replace one-third to one-half of the water volume each time, keep the water temperature stable, and avoid stress reactions. The following are the specific steps and matters needing attention:
I. Water Changing Steps
Prepare New Water
Let the tap water stand for 1 to 2 days in advance to remove the chlorine, or use a water conditioner to treat it. Make sure that the temperature of the new water is the same as that of the original fish tank.
Clean the Old Water and Fish Feces
Use a straw to suck out the feces and residues at the bottom, and pour out about one-third to one-half of the old water. Keep part of the original water to maintain the balance of the nitrification system.
Slowly Pour in the New Water
Pour the new water slowly along the wall of the fish tank to avoid the water flow impacting the fish or stirring up the bottom sand, and prevent the betta fish from being frightened.
Put the Betta Fish Back
Gently scoop up the betta fish with a deep-mesh fishing net to avoid scratching the fish fins. The operation should be gentle to reduce stress.
II. Suggestions on the Water Changing Frequency
Small Fish Tanks (1-5 liters): Replace 25%-30% of the water volume every 2-3 days.
Medium-sized Fish Tanks (5-20 liters, with a filter): Replace 20%-30% of the water volume every week.
Large Fish Tanks (more than 20 liters): Replace 20%-30% of the water volume every 1-2 weeks.
III. Key Matters Needing Attention
Avoid Changing All the Water at Once: Changing more than 50% of the water at one time will cause drastic fluctuations in the water quality and damage the nitrification system.
Consistency of Water Temperature: 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, you can use a transparent container to temporarily isolate the betta fish to avoid damage caused by direct contact with the fishing net.