Currently, I have my thermostat working on two separate tanks (Same size, both Leopard Geckos). I am using ceramic heat emitters, but I want to use a UTH at the same time. So that is 4 heat sources, but the thermostat only has three plugs. I it safe to plug in a rheostat into the thermostat to add more outlets? I want to use the heat emitters as the primary heat source and have the UTHs on low wattage for belly heat. Is this good, or am I over thinking it?