The water change frequency for Siamese fighting fish is usually once every 3 to 7 days. The specific frequency depends on the size of the fish tank, the filtration system, and the feeding frequency.
Small Fish Tanks (1 - 5 liters): If you are using a small fish tank without a filtration device, it is recommended to change about 25% to 30% of the water every 2 - 3 days to keep the water quality clean.
Medium-Sized Fish Tanks (5 - 20 liters): For medium-sized fish tanks, if a filtration system is installed and the water quality is relatively stable, you can change the water once a week. Each time, replace about 20% to 30% of the water.
Large Fish Tanks (over 20 liters): Large fish tanks have a large water capacity, and the water quality is relatively more stable. Change the water once every 1 - 2 weeks, and each time replacing 20% to 30% of the water is enough to maintain good water quality.
Precautions When Changing Water:
Don't change all the water at once. This will disrupt the ecological balance in the fish tank and may stress the Siamese fighting fish.
The temperature difference of the water during the change should preferably not exceed 5 - 7 degrees. Otherwise, the fish may get sick.
You can add an appropriate amount of salt when changing water. Add 0.5 to 1 gram of iodine-free salt per liter of water. This helps reduce the fish's stress and resist infections.
By maintaining a reasonable water change frequency and paying attention to these precautions, you can effectively keep the living environment of Siamese fighting fish clean and ensure their health.