The smaller the system the more important temp is. However as long as you're within 2 degrees of what the display temp is then you should be fine. Using a heater in a bucket/mixing tank works well, just make sure to check it as heaters (even on a low setting) can heat up water fairly fast in a bucket. 
		
	
		
		
		
		
			
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				One more fish should be ok?, right!!!   - Laurie
			  
		
		
		
		
	
		
		
	
	
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