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Heavy-Duty Timer 2 4 6 8 Way Box Grow Light Electric Contactor Hydroponics

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Is this under feeding?

Only affecting one of 3 plants, which is a higher thc strain, the other two are CBD strains and dont have this issue.

All 3 plants are in the same DWC though so they are sharing the nutes.

I've kept EC low through veg, average about 0.8 but I've done a rez change to bloom a/b fert now and slowy raising ec above 1.0 so I'm guessing it's deficciency rather than overdose?
PH has been pretty much in range the whole time, ups and downs.
They have been on 12/12 for about 5 days now.

Current...

Is this under feeding?


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