Magnesium Def? (Pics of course)

In all my years, I never had this situation, and I have been going by the "book." She's under 400MH, in Ocean Forest Soil, all Fox nutes only, and her sisters all look healthy. My watering/feeding pattern is consistent.

At this point, this particular plant has been fed FF's "Grow Big" with only 1 tsp. per gal. If it is magnesium, please let me know. Also, she's the same size and strain (Barney's Tangerine Dream) as the other apparent healthy siblings.

Please chime in....thank you!

If the rest are healthy either this is the first one to go, or my guess would be genetics, ya may have just got a dud man.

Did you check pH/EC of runoff? I had a similar problem with a rogue purple frost and - for some reason - that particular pot just decided to build up salts and pH went all whack which lead to lock out and, as a result, def. Worth a look if you haven't done so already.

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Firstly it looks like they need a bigger pot. Sometimes you get the odd plant that is sensitive to your regular feeding methods. In this case the leaves are reacting to something in the environment. So best thing to do is move her a little further from the central light to take some of the pressure of her to grow, and let her heal. If its a root issue, then a bigger pot might help the roots heal and also stabilize the environment with more soil under her. If its leaves, then it might be she is sensitive to being foliar fed. Either way moving her away from the direct heat of the HID is the best place to start rather than turning too quickly to the product guide for what to buy to fix this problem.