Magnesium deficeincy

ash2803

Active Member
Someone pls help,
i think my plants have magnesium deficeincy.
the lower leaves have gone yellow and started to droop and one of my plants looks like its stopped growing altogether.
i vegged for 4 and a half weeks and switched them to 12/12 yesterday.
They are blue cheese in a 1.2m x 1.2m x 2.0m tent under a 600w hps.
What can i do
 
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