Since I started my tank two months ago I have kept it pretty constant between 78-80.  I actually found out last week that I had my heater unplugged for a number of days and the temp stayed constant due to the lights and ambient room temp.  Maybe as it cools more through the winter I will have to rely on the heater a little more,. 
 
Greg 
		
	
		
		
		
		
		
	
		
		
	
	
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