HELP!! Does anybody know what is going on?

What could this be???

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Thefrog1985

New Member
So I have some blue cookies in the 6th week of flowering planet in 3 gal soil pots and I'm using floranova liquid koolbloom and floralicious plus as my nutrients under thousand watt lights... I noticed they haven't been forming as they should be and I went to look the other day and noticed the top Cola on a few of the plants or completely dried out and looks like the picture I posted.. I found out that my water I've been using was extremely cold through the whole process of growing. Could this be nutrient lock?
 

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