Hello, I've recently made an order for some highland Nepenthes in my Vivarium. Keeping the day temps at 85* will be easy, dropping the tanks temp to 55* at night will not. The plants need this drop in temperature else they'll stop growing and die. So I've been thinking of methods to cool them and the best so far is this:

1. Get a PC radiator for a liquid cooling system

2. Get an aquarium chiller

3. Prop the radiator inside the tank with a small fan behind it and recirculate fluid from the aquarium chiller.

Now that's all fine and dandy, but there's one problem... aquarium chillers cost a fortune, and I honestly can't afford one with the salary that I'm paid. (America needs to get it's act together )

So what can I do? Is there a way I could make an aquarium chiller? Or do you all have a better idea for cooling the tank? After all you guys probably know way more about refrigeration then I do. The tanks dimensions are 24X12X12 inches.