I absolutely love my w/f 8 pack, but a question for all of you w/f users... how do u mix your controller water/top res water? I mix everything im putting in the bottom at "full strength" then fill the top with a solution 1/2 the tds of the bottom, but the guy at my hydro store said just to fill it all with the same strength nute solution, but it seems like that would throw nute balance outta whack no?