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So, yet another odd growth tip issue. All organic amendments, no signs of malformation on the rest of the plant.... Help

So, I decided to SOG one light and within two or three days I noticed discoloration on new foliage. No signs of pH imbalance, nothing on older leaves, just on the growth tips. Within a week, they turned brown. Has anyone seen this? Everything else in the room is fine, the growth tips degraded to...