Welcome! As a newish grower myself and a bit of a black thumb I can tell you the biggest mistakes I've made is in giving too many nutrients and not watering correctly. Northern Lights is the easiest indoor grow and will give you great yields, an excellent pick for your first grow.
$200 is steep. Having already done DNA testing, the cost for me would be $50 which isn't bad. As for it being sketchy in a way you're right. They have similar DNA tests for which psych meds are best for a person to take. Having done that test I can tell you that it doesn't answer a question...
Saw the same thing on another plant although not as bad. Pretty sure it's too many nutes. I was eyeballing it and obviously got it wrong. Will skip feeding this week.
My only idea was that maybe it is from too many nutrients. I'm going to skip feeding it this week. All my other plants are doing fine with the same nutrients though. Maybe I inadvertently gave too many to this plant. Also this plant is a church OG while the other plants that are fine are...