I did some spring cleaning this week, so I figured now would be a good time to make a thread about my big ass vivarium. The dimensions are 36x24x48. It currently houses 2 Ranitomeya imitator "Baja Huallaga." They've successfully raised at least one froglet, but I haven't seen him for a couple of months (not surprising given the size). The tank has been set up since June 2011.
Sure It's a Mist King setup. There's a reservoir and a pump connected to a timer below the tank. I've been using them for 6 years or so and they work amazingly well. The pumps can even run bone dry without getting damaged now, which is a huge plus.
I run it at at 2 one minute intervals each day. Once in the morning and once in the afternoon.