So, my current living situation has me living in an unair conditioned house in 90+ degree weather. My tank is getting up to 86 & 87 in the day. It is only rock and one fish but, I need to cool it down. It is a 50 gal tank with about 5 gals in filter capacity. I have looked at chillers but I have no idea what size/type I need. They are very expensive so I want to know I'm getting the right thing. Anyone have any suggestions? I'm swapping water for cool water right now. I can't keep up with that. Please HELP.