So Thursday the 14th I'm to get my vivarium Electronics ve-2 in. This is my very first rack. Had been using tanks. So I have a couple questions. Have been looking on YouTube for proper setups. Some videos explain everything other than what I want to know. So #1. Where is the best spot for the thermostat probe? The top or bottom tier? #2. What's the best temp to set the thermostat at? I was going to set it at 90. But I don't know. So wanted some expert advice...