bigger pump
			 
			 
			
		
		
		
		tarolisol 
fyi i have a 48" tall skimmer with the same size  tubing for the chamber. the difference between mine and yours is I didn't use the bigger acrylic tubing for the injector - i used 1" schedule 40 tubing.  
I had use the following pump configurations with the results from: 
Not good/ good/ better/ best: 
 
mag 18 and mak 4 to dual injectors - best 
mag 18 to single injector - not good 
mak 4 to single injector - good 
iwaki70 to dual injectors - better 
iwaki70 to single injector - best 
		
	
		
		
		
		
		
	
		
		
	
	
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