There is no specific value for the water depth of grass turtle seedlings, and breeders need to decide the depth according to their body shape. Generally speaking, the water level of turtle seedlings is best controlled below the carapace. Because they are just born, their physical strength and swimming ability are poor, and their adaptability to the environment is also poor. Breeders control the water level below the carapace, which can ensure that they can move and breathe normally and avoid choking and drowning. With the increase of their size, the water level of feeding can also be raised. When they mature, the height of water level can be controlled at 1-2 times of the height of carapace, and the maximum should not exceed 2 times.

As mentioned above, grass turtles are not pure water turtles, and they are not suitable for living in deep water. Moreover, they breathe with their lungs and need to float to the water regularly for air. In addition, the water quality of grass turtles is not very good. If the water level is too deep, they can't swim to the water surface quickly, and they will choke and drown.

If breeders want to keep grass turtles in deep water, they can build a balcony or gentle slope in the container, so that they can choose the water level at which they live. Moreover, grass turtles can't live in water for a long time. They need to climb to the shore every day to bask in the sun.