black leaves

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    Plants looking unhappy! Help please!

    Hey guys, I'm currently doing my first grow using rockwool 6'' cubes x5, Using a 5 gallon pot as a reservoir, feeding every 3 hours, about 8 cups each plant and not to waste. The nutrient breakdown is Big Bud( first 2-4 weeks flower) Calimag (when not using big bud), FloraMicro, FloraGrow, and...