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At the moment I am inclining towards magnesium problem. Gave all the plants RO + Epsom salt @500 ppm today (1.5 tsp/gallon) ph to 5.5. Someone from the other forum advised to hit really hard on first treatment with double dose for magnesium problem specifically in coco, then reduce to normal...

This 600ppm is right after I did my monthly RO flush... Before the flush it was 700ppm every other day with no problem at all.. I really doubt it is overfeeding... The rest of the leaves are still very perky and nice lush green. Only about 10% of the leaves affected by this problem...

Sorry for the small pics..... Size corrected... Cheers!!

High All!! got a really weird problem. As of last night my leaves are lush green and very healthy. Then now 13 hours later I saw ALL of my 3 plants have crispy dry leaves on older leaves... Judging from my VERY limited experience, I narrowed down the cause to either magnesium or phosporous...