Advertisement Hello, I am looking at building a group of enclosures that will house several tarantulas in a display. If heating the room to 74°F is not an option with a space heater, what else can be done? Here's my idea, can you help me brainstorm and improve it. (It's fairly crude right now) Worries: 1. Heating 'element' is fish tank heater in the back to heat distilled or di water. This will create a "hot" spot on the side of the tanks. 2. Ventillation is a concern for the middle enclosures. I have it where the holes are drilled through all surfaces shown. Should I put vents on the fronts as well? Anything else?