Is the algae just on rock or everywhere.  
 
IMO 2 feeding a day is to much. Also depending on amount of food.  
What's your cleanup crew 
I would either toss the floss or change it daily 
 
Myself I would do some large frequent wc and clean rock. Increase cuc and feed a little less. Jmo 
		
	
		
		
		
		
		
	
		
		
	
	
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