I was posting when you posted these. The blanched leaf tips are another early indicator of nitrogen overload.Ok well i guess I am going to bump this with some updated pictures since no one seems to have any idea what it is. These pictures you can see it alot more since it has gotten worse, and its looking like its going to spread to the next node down. Its closest to Magnesium def it does not match with any pictures really(Where is mr BUDS and his expert advice???)
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find out the ph of the soil first and foremost..get it 6.5 and givem a lil cal/mag and light nutes..shouldn't get worse