Plant diagnosis Needed!! (pics)

HarryRePotter

Active Member
powerplant clones 4th week bloom
ionic nutes n boost
2 x 400w hps
Nft gt424
temp 25-28c
res temp 20c
Ph-5.8

Just back from checking the ladies that are at a friends. Can anybody tell me what could be causing this on all of them. At first i thought maybe the light was to close, so i moved it from 12"-15" from the highest plant. But it is happening on the smaller lower fans, they appear darker than green normal and with small bumps on them. Any help appreciated.
 

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my book said it looks like zinc defecentcy

it said to flush grow medium with a deluted complete fertilizer.
 
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