I have a nepnthes tank that I keep cool with a small refridgerator and water pump. I don't know how much you want to spend, or how complex you want to get but it WORKS. I use a Fluval 205 canister filter INSIDE the mini fridge, with the suction and discharge lines running out of the top of thefridge. You have to drill holes in the top of it of course. The discharge line is plumbed into a makeshift radiator made from a coil of copper tubing that is hidden inside the tank and it has a computer fan blowing across it. The suction side of the pump is connected to the other end of the coil, so it just runs in a loop.
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