In geomantic omen, fish farming is moving water, and it can only flourish if it is placed in the direction of Wangxing. Turtle doesn't need water, but it should be placed in the prosperous position of the mountain plate. Even turtles don't have to have a specific place. The tortoise will naturally choose its favorite auspicious position.
To find out where the prosperous position is, we should fully understand the surrounding environment, sitting direction and internal spacing of the house.