LightingQuestion
			 
			 
			
		
		
		
		Hi: 
 
I am new to this hobby. This may be a dumb question, under what scenerio you need a 400w MH. I currently have 1 90G with 4X48" VHO. I am thinking of upgrading it to MH. Should I use 2x250 or 2x400? 
Currently I have no SPS. I plan to keep some SPS and claims after the upgrade. 
 
I currently  have 150 PD live rock, CC sand bed, the tank is 48 * 24 * 18. 
 
Thanks 
		
	
		
		
		
		
		
	
		
		
	
	
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