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Using GH FloraGro nutes and brand new custom drip system. After 2 days under the drip, the rockwool cubes are turning brownish all around the dripper stake... Is this normal??? Hoping to G that im not already getting algea or root rot, but the roots are all pretty and white so far..

I have 3 mother plants approaching 30", and I fear my current lighting is becoming insufficient. I have a 4' fluorescent fixture with 4 32 watt T8 6500K tubes. My plants have been starting to appear as if they've been heat stressed or nute burned, but they're growing in Happy Frog potting mix...