Blueberry auto on week 7/8, in 5g with fox farms. Light tsw2000 on max 18/6. Temps 77 with lights 70 off. Rh 50 with lights, 60 off. Only fed it small doses of Mega crop. Using tap water that's been pH to 6.5.

This started 5 days ago and is just getting worse. I have flushed it and seeing no improvements. When I did flush I noticed the pH was low on run off. I seem to of fixed that now. It's mainly the upper leaves. Any help appreciated. Think it's got a few weeks left. Unsure if I should just chop it. Kinda bummed but my first go at this.