First grow, need a little diagnosis

It looks like you have some good help here, but I was wondering how much are you feeding the plant right now? Are you at the manufacturers doseage? I read a post earlier in this thread stating to start off at 1/4 dose. Great information. Is it possible you have been giving it more than that?
It looks like overfeeding to me, but it's just my opinion.
 
If you have, or can get, a PPM pen then you can measure the amount of food and other stuff in the water before you add it to the plant.
As a guidline you would want to follow the chart below:


That may vary with autos and most likely be lower values since you're not vegging nearly as long.
 
I think the confusion is why you'd flush with 6.5 PH water
Your PH sweetspot is 5.8

Exactly. Sorry I wasn’t more clear. Flushing is a good idea, if you’ve eliminated environmental factors. The general rule of thumb is 2-3 times the water for the size of the pot. Do it slowly and evenly. On the last water use quarter strength nutrients.

:nomo:

Just to confirm. You have a viaspectra 1000w led light and it doesn’t have separate bloom and veg switches. I live in the UK. I think they all do here.
 
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