Tony I don't think it's directly a ph problem. 
I just got my moniter calibrated and such and here is my results. 
tank ph=8.15 
reactor ph=6.58 
I suppose it could be a low ph + something else but I don't think it just has to do with low ph. 
 
Hope this helps in some way 
		
	
		
		
		
		
			
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Jonathan 
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