Plant Problem Top growth stunted

It's my first grow, I've got four girls (Sour Diesel Sweet Island Skunk cross breed) in a DWC, yet only this one is showing signs of sickness. I'm using AN's iguana juice grow and bloom. PH is 6.0 right now. I did have trouble with root rot earlier but I thought I eliminated it with some peroxide until the slime was dissipated. It seems just the top fan leaves and nodes are droopy. :peace:
 

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Also, forgot to add, I was hoping to start flowering this next week, I'm using Co Co brick for my medium, they are on a 18/6 light cycle under a 400W MH bulb.
 
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