Those are called hydro balls. Clay pellets that are used for a drainage layer. I put about 6 inches of those, held in place by a turtle bridge placed on its side, which allows water to flow through but not frogs. Then I put a mesh layer on top of the balls, then coco fiber. Before that I installed a black PVC tube with holes drilled in the bottom few inches, down through the balls and that is my water intake to my cannister filter. The water comes back in on the other side onto a corner unit I bought at petsmart for a waterfall. They love to sit on it and let water run over them.
Here is what that looks like...
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