NeoMarius
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You should only have to fill the tank up, not empty and refill. When water levels go down just add more. Change water out completely just to be safe every 2-3 weeks or if its time to change your nutrient formula. With your aerator the water will stay oxygenated and as long as it was pure to start, youve kept light out of your resevoir, and no plants have died it should be fine. When a plant dies its root system releases a certain set of hormones and will adversly affect the rest of your grow. I would suggest getting in touch with Shady and Ronvmpc also, you can find them on my grow journal ninja grow if you have trouble searching them. Very knowledgable and very classy gents.