After the sun has passed and doesn't shine directly through the windows, I often open the blinds.  Have never had extra algae problems from doing that.  I think if there is going to be algae problems, there would have to be excess nutrients to fuel the algae growth.  Best to keep nutrient levels very low. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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