Map fish consume a lot of oxygen and have high requirements on water quality. Changing water frequently can ensure the cleanliness of water quality, increase the oxygen content in water, accelerate their metabolism rate and promote their growth and development. When changing water, pay attention to changing water regularly, about once every two to three days, only one-third or two-thirds of the water in the tank at a time, and change all the water in the tank within one week. If the water to be changed is tap water, it should be dried for a few days to remove chlorine from the water. If the whole water should be changed, the fish should be fished out first, and then the fish tank should be carefully cleaned and sterilized.

To feed map fish, it is necessary to ensure the cleanliness of water quality, so it is necessary to change water every two to three days and change all the water within one week. Before changing water, in addition to putting water in the sun to remove chlorine, the cylinder should be sterilized and disinfected, and crude salt can be put into the cylinder. When changing only part of the water, remember to suck out the impurities in the water as much as possible. After replacing one-third or two-thirds of the water, pour in the prepared water.

When pouring out the water in the fish tank for water change, fish out the map fish and put it into 0.5% sodium carbonate aqueous solution. After about ten minutes, fish out and put it into the cleaned fish tank. Changing only part of the water, but not all of it, will promote the growth of this fish, and putting it in water containing some crude salt will also increase the appetite of this fish.