03-21-2012, 09:56 AM
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A computer fan or just any small DC powered fan you could get for a few $ and wire it to a converter. I know I have a few lying around that I have just scrapped from various dead electronics. Most my tanks are kept at 80 so it has to get quite hot to affect them. We have an AC but its just a small room unit that just manages to keep a 2 bedroom apartment bearable most of the summer. I let my tanks be until they get into the upper 80's, then I cut down on lights as my lights put off a good deal of heat. Sometimes I use cold soda cans or frozen water bottles if I need to lower temp. Usually I prefer just doing a cool water change right around the middle of the day if weather is really hot. Little things like leaving lids open can help as well.