Azureus Terrarium

In this 120 gallon Perfecto long I am doing the waterfall and stream using a 350gph magnetic drive pump that can be used either inline or submersed. There is an open area behind the rock wall, on one end of the pile of rocks, and there is a small pool about 4" deep for the pump to sit in. The water then is pumped up about 8" and then over to the other end of the tank just under the surface of the subsoil. When it is close to the opposite end it splits and forms a waterfall. The other end continues another foot or so and then a 90* plastic elbow points the rest of the water downward through about 12" of gravel behind the rock wall. The water then makes its way "underground" so to speak and combines with the rest of the water forming a small stream in front of the tank that flows across the front of the tank and eventually back to the small pool behind the rocks on the opposite end where the pump is. That way, I have a fairly decent biological filter and waterfall at the same time. About half the water being pumped goes for the waterfall and half for the "biological filter". I don't worry at all about the frogs getting "lost" down in the rocks or whatever. One thing I learned in the greenhouse is that the frogs can easily navigate through a pile of stones three feet deep and five feet wide and eighty feet long and still make their way to the surface as needed. In fact, I think they enjoy it. It also helps them find humid enough spots if the air dries out a little too much. My opinion is that the more rocks they have to navigate and search through the better and more secure they feel. You may not always see them, but they are probably just fine and will surface sooner or later. Of course, my only experience has been with D. azureus who often use boulders in their natural habitat. I can't imagine why other Dendrobatitds wouldn't behave similarly in the same setup though. I don't worry about food items being lost either since I use a lot of cocoa fiber and leaves to ensure a healthy springtail population exists and until that time I simply feed a lot of wingless fruitflies.