Question - If I had a perfectly usable tank that had a wooden bottom and had caulk in a few places, would an undertank heater work alright with that and would that be a fire hazard? Would it melt the caulk? It's only an idea that I'm toying with, it'd be for a leopard gecko and reptile carpet would be put down so the gecko itself wouldn't be touching the tank bottom obviously. Preemptive thank you's