I really don’t know but mt guess would be ph outta whack
Update:
@Sirsmokes It was not my pH but leaf miner larva that cause those streaks. Amazingly, I got responses within 2 minutes of asking for help - Help! What is doing this to my vegging plant? Here’s hoping it doesn’t get worse once I start the neem oil application.
However, the top of the plant looks amazingly happy and has developed a sickly sweet marijuana aroma.
I dearly hope this plant will reach flowering and net me some smoke, bit worried…
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I don’t remember if it’s a auto or photo but if it’s a photo you will be fine aND if it’s auto as long as it didn’t stall or stop growing you will prob be ok
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It’s been three days and none of the remaining leaves are showing signs of leaf miners (phew).
I have one of the older leaf-miner affected leaf in a zip-lock, but there are no black flies in it yet.
The top leaves are HUGE now, almost too big to fit in the palm of a hand.
There is lots of new leaf node growth at the base of old leaf stems and there are no signs of nutrient burn.
I upped the nutrient strength to: 8ml/L Grow, 4ml/L Micro and 2ml/L Bloom from today.
I’m still waiting on a flowering light, so it continues under a 18/6 cycle.
The plant looks a bit droopy like the weight of the huge leaves is too much for the 2mm stem.
Having said that, the top of the plant continues to produce fresh leaf sets and looks happy.
Oh and the aroma has gotten stronger 
@Sirsmokes It’s not an auto, just feminized Sensi Seeds JH.