Self Sustaining Vivarium?

[ToadPaparazzi]

I recommend using egg crate instead of hydro balls; your reservoir will hold much more water and allow longer intervals between draining. You can also have your tank drilled for a drain.

[deranged chipmunk]

I wouldn't use an under tank heater if you have a water reservoir. Too much risk of cracking the tank. Hot heater+cool water = disaster.