1. Canvas pond culture has many shortcomings. First of all, it is difficult to take care of them, especially to clean up the green algae.

2. Second, the appreciation is also poor. You can only look at the fish from above, and it is generally placed in a relatively low position, and it is not difficult to look from other directions.

3. In addition, there are some restrictions on raising fish, which are only suitable for raising koi fish and goldfish. Because this kind of fish culture is not easy to control the temperature, it is impossible to raise tropical fish.