Need a little help please

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Hey guys

My first time trying to grow and I'm looking for a little help.

So I got a Clone of Platinum green crack and just kind of ran with it when it came to set up and growing.
My first time growing I went cheep really cheep. So here my set up.

A Carboard moving box lined with reflective silver lining. A fan blowing fresh air in the box and a LED full spectrum light from Canadian tire just one of them single bulb grow lights. Flower is planted in MG organic soil and I'm doing 18/6 for light.

Plant was growing fine for the first week it grew 3 inches from when I had gotten it and it looked great. Then the leaves started to turn brown. Talked to a few people they said check the Ph of the water I was using and the run off. The tap water I was using was sitting at about 7 and the run off was over 8. Added some white vinegar to the water and lowered the PH down, Run off is not sitting at about 6-6.5. I also Toped it and flushed it with the new water.

I'm not adding any Nuts to the water it's just tap water right now I do have MQ nuts to add later on but I want to fix this problem first.
Gonna add a couple of pictures and see if you guys can give me any advice and point me in the right direction to get my lady back on track.

Use fox farm soil

 

[cannanewb]

Nothing but pro-mix HP soil less mixture with General hydroponics 3 part nutes with Calmagic and liquid kool bloom for added boost in flower. In New Brunswick Canada..