Don't waste your money on this fixture. TEK's are cheap now that the elites are out. You can get a 6 bulbs for $340 now and your going to have to change out the bulbs on the "fishneedit" fixture. Spending that extra bit will be well worth it.  
 
imo for a 90gal a 4 bulbs is garbage 
		
	
		
		
		
		
		
	
		
		
	
	
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