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My best theory right now is that there just isn't enough water in the res for all 4 plants. The res is more roots than water at this point and I think that this small of a res can't support 4 large plants. So perhaps they're all competing for oxygen...in the water...or...
As I said, it is the one with the purple roots and I've noticed some of the branches have been purpling a bit for awhile now but I thought it was normal...
If the roots of these plants keep growing at the pace they have been there is no way all 4 plants will survive in this space. I don't see a way for me to get a new res during this grow so it might be beneficial for me to chop this plant anyway to make room. I could move the smaller plants around to make the best of the space I have. I just don't know if I would reveg if I do that to refill the screen or...shit I'm just getting ahead of myself right now.
I rinsed the hell out of the rockwool cube and roots with plain cold water and misted the crap out of the leaves. I can't dump the res until Friday...
As always, any help/advice/suggestions are appreciated.