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Seeking knowledge and wisdom in the cultivation of cannabis. First time grower, flood and drain system, 2 1000 watt hps hdrofarm lights, Co2, GH flora series nutes, Blackberry kush...

My roots are black and slimey between the rockwool and the cococoir mats I have each plant standing on in my flood and drain set up. The roots that are coming out of the coco coir are white and healthy. I also have black gnats. Ive added azamath to both my res. Any advice?