The initial death of fish was mainly due to the imbalance of water environment. Before using the cement pool, please clean the pool to prevent pollution. In addition, it is best to add some nitrifying bacteria, or add something to cultivate nitrifying bacteria in the water, or add some green water (that is, old water) of unicellular algae to balance the ammonia in the water.

The advantages of fish culture in cement ponds are good light and large space, but the disadvantages are that it is not easy to clean up and it is necessary to prevent natural enemies.

Keep warm in winter, shade in summer and cool down with cold water.

In addition, make sure that the goldfish added are healthy, do not add sick, and the amount of bait should be appropriate! Pay attention to fresh water.