I need to run a couple fans on my tank for cooling over the summer. I'm running T5's on the tank so I don't need a chiller but the temp hits about 82 over the summer and down to 80 at night. Does anyone know how to make a controller to kick the fans on when temp gets to high. I would like to keep temp at 78 like it is during winter. Last summer I just ran them when my lights were on but temp fluckuated to much. Any help would be appreciated.