12-20-2009, 01:09 AM
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with a 55 I would use two heaters I would say 2 200-250 watt would be able to handle the cold basement. heaters can only heat a tank so much before it has to shut off and if the room temp is much cooler than the tank temp than you will need a larger heater to make up for it so if a 200 watt says its good to 55gallons that is IF the room temp is only a few degrees cooler than the tank. if it is a big diverence I always get a bigger heater. I keep my fish room cooler to help keep the humity down so I run 200watt heater in al my 29s and they stay about 82 when my basement is 70 or so.