If it's not mistaken, african sideneck turtles can be outside or inside the water. However, how long can these turtles survive inside or outside the aquarium?
On the other hand, what if I put sand in the tank for african sideneck turtles? Is sand good for the turtle?
True, african sideneck turtles can be in and out of water. They will go on dry land to dry themselves. So, when their bodies are dry they will return to the water and dry out again.
You can use sand as the substrate. Importantly, you must install a filter to maintain the water quality.