Help figuring out whats wrong please :)

She seems to be growing no problem. 12 days old. However she has had some weird coloration on the leaves since day 1. I am in coco and have started her on light nutes this week. I have only watered at 5.9 ph. The edges are developing a weird yellowish and brown? Would that be nute burn? I have no idea. Sorry for the blurple. You can still clearly see what Im talking about though.

Medium: Coco

Pot:3 gal

Runoff- 7.0

Nutes: GH flora micro, bloom, and cal mag

Light:Viparspectra 300w 24 inches high

Tent:2x2x4

Temp:79

Humidity:40% to 51%

Runoff is high what have had it at going in?

Herb & Suds said:

Runoff is high what have had it at going in?

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5.9 going in the whole time. I tried a flush the other day with many gallons of 5.5. The runoff never changed.

Sounds like you don't have much for roots ...I'm stumped sorry

Can you take a pic with the light off?