Fish farming is not about fish, but about water, so there is a saying that water is tolerated. Fish is just a foil. If set off well, it will play a icing on the cake. Otherwise, it will be self-defeating
One piece of white water, two pieces of black soil and three green trees. . . . . . . Thirteen is three, that is, wood. According to the five elements, that's aquatic wood. Then your water is not strengthened, but weakened. Why do you need this fish tank?
Then there is the color of the fish. It's good for the black five to act as gold and gold generates water, but if it's soil, what's the use of soil beating water?