Heating a plant terrarium
So, i've got a small 20gal long terrarium set up. Not all beautiful and planted like most of yours but just a tank with a good lighthood, got the case fan installed inside to provide movement and ventilation. I have standing water on the bottom and a coated wire rack above that for my orchids. They are mini intermediate growers that like medium to bright light. My problem is temperature. I have a hood with a 55w compact fluorescent sitting on top of a glass top covering most of the aquarium.......all but maybe 2" for fresh air. It only gets as warm as the room, maybe 68-70+ when the heat is on. I need it to be at least 75 degrees to get things to really bloom well. I bought one of those heat pads for a 20gal. It does nothing. It is barely warm. Doesn't boost the temp at all.
Any options to provide more heat to the tank? A really big external heating pad? I need to keep the glass on top of the aquarium to maintain 50-60% humidity, so I really can't benefit from the heat from the lamp.