It can take time... Do you know what kind of algae you have?  
here's the approx dosing on R2R thread for certain algaes 
 
"Cloudy/hazy Water- 1 dose 
Diatoms - 1-2 doses 
Cyanobacteria - (Yes, it will outcompete another bacteria) 1-5 doses 
Dinoflagellates - 2-5 doses 
Bubble algae - 3-8 doses 
Hair Algae - 3-5 doses (depending on species of hair and how bad the infestation is) 
Turf Algae - 8-20 doses ( again, depending on species and how bad the infestation is) 
Bryopsis - 6-30 doses ( again, depending on species and how bad the infestation is)" 
		
	
		
		
		
		
		
	
		
		
	
	
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