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What was the EC of the water/ferts when you watered them last that caused the run off to be so high?  Is  the coco/perlite mix fortified or a soilless mix that’s inert with no significant nutrients?  Were they drying out before getting transplanted as hydration affects the availability of nutrients in the rhizospehere (aka root zone), so something as simple as being late on transplanting and letting them dry out a bit too much between waterings can express as a deficiency when the issue is actually unrelated.  Diagnosing problems is hard as you need a holistic approach that considers how interdependent everything is in a grow, which is much harder then just looking at nutrients issue charts and trying to match a leaf to solve the problem.

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