1st DWC attempt, advice needed :)

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Hey guys, hope you're enjoying your weekend and by enjoying I mean smoking your faces off. I've copied the latest post in my current grown journal to try and get a few opinions on my plant. Feel free to browse through the thread if you got time but if not heres the quick rundown:
-1st DWC attempt
-Didn't calibrate my PH and EC meter til I was two weeks in - got a stunted plant now
-had lot's of roots breaking off but seems to have stopped now, root system underdeveloped

Other than that she still wants to live, here's the post so anything you can help with is greatly appreciated folks, really :smokebuds:

Day 27

Morning all, receiving some mixed signals from my girls so I hope theres someone out there that can help today, I'm gonna make a post in the infirmary section also to try and get a few opinions.
The problem is that whilst I seem to have found a fairly sweet spot for the top and new growth (all green no burn), the older fan leaves are starting to fade in colour AND have tip burn. I think it may just be super greedy for the calmag under 24/0 led lighting but I'd love a second opinion on this because I can't see how it can have tip burn but still be hungry. Tomorrow is the start of week 4 so I could make a fresh res today or tomorrow. PH remains very stable at 5.7, EC has risen from 2.0 to 2.2 (1.6 to 1.8 without background ec) Does that mean she wants less? As I said I will post in the Infirmary section but take a look at the pictures and let me know what you think, it's really appreciated

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Would love some input on this if anyone has the time, I've got a few more pictures of the effected leaves, I think it's magnesium but there's every chance I'm wrong so it's safer to consult AFN doctors ;) thanks in advance for any info :smokebuds:
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