Currently I have a 20 gallon long terrarium. It's a consistent 65 degrees down in my basement where it's located. I have a full spectrum light that is good for the plants but doesn't add heat. What bulb would do good for adding about 5-10 degrees of heat while also being good for the plants? Or am I better off doing the heating pad affixed to under the glass? The only problem with that is I'm not convinced it would add much heat as there is 4-5 inches of soil for the substrate. Due to a lack of options right now for newts/salamanders I was going to add a Milk Snake to the vivarium.