Muddy
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The crushed dolomite lime should also work.  It will take a few days before you see a difference in the pH.  As to your seedlings dying, are the stems getting thin and brown right at the soil level?  If so, it's called damping off.  Mix 1 tablespoon of 3% hydrogen peroxide to 1 quart of water and spray them twice a day with it.  
https://www.autoflower.org/f42/damping-off-causes-treatments-1946.html
	
		
			
		
		
	
				
			https://www.autoflower.org/f42/damping-off-causes-treatments-1946.html