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Do I really have to use a heater for a planted tank? I know most of you 
don't. I have a 55 and a 37 gal. Both with 150 watt heaters. I live in San 
Antonio, and it gets hot here. Highest temp in my house is 77, lowest is 
73(at night). Right now (noon central) the temp in my 37 is 78 with no heater 
and room temp it's about 74. How could my tank be that hot when the room is 
colder? The heater is unplugged. I have 4 20 watt lights over it. Could the 
fish adjust to that temp everyday? The temp would probably raise and lower 
about 3 degrees.