Just keep adding mag supplements to the tank its takes a lot to raise it like mine was recently 900 and wanted to get it back and I had to add over 5L off bulk mag mixed up over the course of a week to raise it 
		
	
		
		
		
		
			
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				Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC,  QT everything
			 
		
		
		
		
	
		
		
	
	
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