Steve, I think ya got a bit of magnesium deficiency going on there, not nute burn: Revised: The Complete Guide To Sick Plants,pH and Pest Troubles - PlanetGanja.com
she's 50% Cinderella 99, which has been called a 'magnesium hog' before ... I never found that to be necessarily so, but it's something to think about ... but, don't go too wild with anything to remedy it, she tends to be a light-to-medium feeder, in my experience ... :jointsmile: