I just bought a used 50 gallon tank, which I stuck all my helis, my Prolifera, highland Nep seeds, adelaes, and bladderworts in. I really need a way to cool these plants because they all love it cool and humid. I have another tank which uses water that circulates through a fridge and cools it off, but doing the same for this one would be ugly and expensive. I've heard of "peltiers". Could I use one with a fan blowing over it to cool off my tank? Don't peltiers generate a lot of heat? Thanks for any comments.