Fan leaves slowly turning yellow, slight interveinal browning

conscript

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No pics, yet. Plant is small and I need to find the right camera.

I have a plant about 1 1/2 months old, sitting in miracle gro, indoors (for now), under a 100w blackstar led ufo. Over the past 2 weeks fan leaves started turning lime green, some tips started curling under and at the spot of the curl was concentrated yellowing. The leaves are also slowly drying. Brown spots are barely visible in between veins, but present all over the leaf. A light under it reveals them (trying to get a pic of this but it's difficult).

The ph of my water is around 7, if a little lower. No ferts introduced yet. The plant has also appeared to enter flowering early, despite 14+ light hours and small size (not even a foot), with hairs and trichomes everywhere. However, plant growth is stunted and concentrated a bushy ball, which I believe precedes the yellowing.

I have since transplanted into a new, bigger 5 gallon pot (I forgot to mention, the plant was in a small bio degradable cup and I discovered the roots had reached the bottom) with dirt I bought for a garden a year ago. The roots are still in the miracle gro for the most part.

Furthermore, anybody know how purple plants develop their color? The seed was from a purple bud, and at the very top of the plant, young leaves have a dark color (which, when I brought under a light, was almost certain it was purple, not black) on their tips and margins.

I appreciate any help. If you're curious about experience, I have grown seed to harvest once before.

I promise pics tomorrow.
 
I was thinking the same thing. I had a similar issue last time and I used miracle gro then too. Does mg not have mg? lol

Here are some pics. I don't know what's up with the second one, it must be the flash that made it look that way. But you can see the shade differences at least.
 

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