ok so ive got my incubator built but im having trouble keeping a constant temperature. could i solve this with the water wiggler and reading the temps from it? ive got my incubator built out of a styrofoam cooler with a 40 watt lightbulb for heat. ive got a small pc fan for circulation. i left the hole that i ran the wires though unsealed could this be a problem? its only about the size of a pencil.