Help!

Alexs

New Member
Growing 2 think differents under 400w hps in coco. On one of them I have noticed this, mostly on the top of the plant. Is it heat damage?
Cooltube is about 6-7 in from plant and temps are normal. Water/feed every other day 3liters . Its strange because the other plant I have treated the same and its fine.
 

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