Choose the right variety first in tank culture. Different from the traditional fish tank, the ordinary water tank can only be observed from above, so it is suitable to raise some back-watching fish, such as traditional goldfish, koi fish, and new back-watching medaka, etc. These fish are wide-temperature fish, so it is also very suitable to raise them in the water tank.

No matter what container is used to raise fish, we must pay attention to the feeding density. Usually, one centimeter of fish can be raised per liter of water. However, because there is no filtration system in the water tank and oxygen pump is generally not used, the water quality maintenance ability is weaker and the feeding density is smaller, so as to ensure the breathing and growth of fish.

In order to maintain water quality, change water to the water tank regularly. There is no fixed period for changing water. Because the size of water tanks is different and the number of fish is different, the deterioration rate of water quality is different. If the water quality deteriorates rapidly, it should be changed once every three days. If the water quality deteriorates slowly, it can be changed once a week.

Pay attention to feeding feed during daily feeding. Because of the different kinds of fish, their feeding habits are different, but fish food is usually enough. Fish food has granules and slices, which can be used as long as it is convenient to clean up. Feed it three times a day, and eat it within 3-5 minutes each time.