As I said, it's not fancy. I got a preformed water fall from a guy, IDK small foam thing, might be a zoomed????. It has a reservoir (that's where I have found the bp's soaking) But I made it spill over the lip into the dirt where I put the bio balls in the corner and buried the pump, covered them with the mesh stuff and them filled the fish tank with 4" of the eco dirt. I bought one of those small pumps from Hagen and ran a tube up the back of the waterfall.
The salamanders and toads like it and they can't get out the top of the tank behind the lights, so I don't worry about the holes in the top, but the lost bp's must smell the water because that is where they go. Funny the lost boas never go there, I find them other places.