Really "cooking" your rock means COMPLETE darkness for 3 months at least.  The rock should end up looking like a..........rock.  I mean regular rock, no coraline, just a very porous rock.  The process forces the bacteria to feed off Phosphate and stuff that's in and on the rock, it's a way of "recharging", or "turbocharging" the rock.  Problem is, the rock doesn't look as good until it's been back in the tank for a few months.  You can use much less LR, if it's all cooked. 
		
	
		
		
		
		
		
	
		
		
	
	
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