Alright next question... Heaters! Looking more towards golden bell frogs now as they would appreciate more water (really liking the paludarium idea), so they need to be kept a little warm and have not thought too much about fish yet but i do like tetras, which will need heaters also as my house is cold... In this situation can you get one heater to heat both the water and terrestrial environment? An undergravel heater maybe? Would keeping the water warm and having a light emitting a little bit of heat be enough?