the plants in my vivarium arn't growing. i suspect the humidity isn't high enough. most of the plants are in a epiphyte type situation with the plants mounted on pieces of wood. they dont have much soil to hold moisture. and the water at the bottom of the tank has no way of getting to the plants above it. the easiest thing to do would be to get the cheapest pump i can find and run a tube behind the background and let the water from the tube trickle down the wall. where can i get the cheapest pump. ebay, lowes, and walmart seem like my best bet. ive found a fountain/aquarium pump with a current bid of .99. i wont bet that at lowes or walmart assumeig no one else bids.