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is it really necessary to add nutes that carefully? i am running a 300 gallon UC system and i just add nutes one a time to the main control bucket and havent noticed negative results. Takes me 10 minutes to add nutes to get my EC number up to where i want it...for reservoir changes i am a bit...

So i am thinking of building a panel with 100 of the new 660nm crees and 100 cree-xte-5w in white. Should i mix in some blue as well? What kelvin is a safe bet for the whites?