I'm building a 55 vivarium to house succulents, cacti, blue death feigning beetles and a young albino leo. The substrate will consist of lava rock and gravel on the bottom for drainage, a layer of sand and topped off with pea gravel. I have lots ot drift wood and rocks for hides. Lighting is T-5 plant, a 10k sun light an actinic from my reef keeping days. I run the lights in cycle, so that the temp runs from 75 at night to 88 during peak hours. Now, after all that, I'd like to know if anyone keeps their heat pads inside the tank. After 45 years of fish keeping I know what a major pita it is to tear down a tank to get at a defective piece of equipment.