After looking at a Vivarium website my little obsessive mind is stuck on a desert setup. I doubt that any frog would be appropriate but there are rivers running through deserts in the Southwest (San Juan, Rio Grande etc.) Since I spent some time in Colo. and hiked the Mesa Verde Park I imagine a setup with a cliff dwelling background but simpler. I have never tried Quikrite and foam but this seems the best option. One thing I learned from using GreatStuff and silicone....wear disposable gloves. Any suggestions, folks?