I have a small 32 gallon biocube that i have modded out with a sump and apex system. I am starting to plan for the summer, and worried that if we have some hot days, that the fans integrated wont be able to keep up (no ac in the house) I was thinking of taking an old 5 gallon water cooler. And using it as an emergency chiller if this get bad. My thoughts are fill it up with water and ice. And coil about 10 feet of 1/4 inch tubing inside of it below the water line. Then configure the apex to turn on a small water pump if the temperature gets above a certian setting. Has anyone tried something like this before? Another option uses the same concept but with a sealed jug if water is a small beer fridge , but that always runs into the critical risk of taking up space that could be better used for beer.