lockout?

Problem: leaf clawing and burnt leaf tips Medium/grow method: Fox Farms Coco Loco, outdoor, 3 gallon fabric pot, PHOTOPERIOD Feed: and supplements used: local grow shop house blend. Includes base bloom, bloom booster, smart tea, cal mag, silica substance for cell strength water source: tap...

Hi All, Around day 65 and I've run into issues with my setup... Both are the same strain (GCS Tangerine Dream), popped on the same day... Medium is "RootFarm" (a soilless mainly coco mix) with about 30% added perlite. AN PH Perfect 3-Part nutes AN Calmag 2ml/l Day 74/Nite 70 40-45% RH Light...

Just changed to a different flowering nute and this happened within one single day. Is it lockout of Mg or Mn? Other? I flushed with H2O and reverted to prior nutes. Hope it is OK but am curious as to the root cause. Here is the picture showing a good LST and the issue at hand.