help red stem plant stop growing!!

sammoth

Member
Hi, this is my second crop so i was hoping it
wold go without problems, but while one is growing tall and juicy :) the other stopped growing and the stem got red in the middle, i think i overdosed her with my guanokalong nutrient, if that is the problem what should i do? water it only with clean water? its has new leaves growing in the central head but they are like that for some time. i really dont know what it is :(
 
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