Betta fish is a gill fish, so it doesn't need too much living space, so choose a 15*15*20 fish tank. Betta is fierce by nature, so it is best to raise it alone. A betta fish can also be raised in a 10 cm fish tank. The water volume in the tank is at least 3 kg and the water depth is at most 20 cm, but attention should be paid to the influence of water temperature and water quality. Because the fish tank is not large, the water quality problem will be quite big, so it is necessary to change the water regularly, control the water temperature between 22-24 ℃, keep the acidity between 6.5-7.2, and ensure the stability of the water quality.

The fish tank should be placed in a well-ventilated and well-illuminated place, and pay attention to the illumination time at the same time. Some shields should be placed at the bottom of the fish tank, such as pebbles or algae such as aquatic plants, which should not contain calcium, which is conducive to ensuring the cleanliness of water quality and increasing the oxygen content in water. Placing some bottom sand can help stabilize aquatic plants and facilitate the adhesion of microorganisms in water. The best ratio of water to sand is 5: 1. However, do not arrange some rough or sharp protruding substances in the cylinder to avoid hurting them.

White sand and sunken wood can also be selected for the scenery. Sunken wood can change the acidity of water and make it more and more acidic, which is more suitable for raising betta fish and providing them with a place to escape. Filters, heating rods, thermometers and other equipment should be placed in the fish tank to provide them with a more comfortable living environment. It is best to place a small lamp with softer light in the cylinder.