aphexbganswered grow question 4 years ago Hello there, please share if you find out, I think I'm having the exact same issue myself with my Amnesia Haze Fem Auto on my 1st grow ever. (biobizz all-mix soil, with BioBizz organic starter pack Bio-grow, Bio-Bloom and Top Max )
I didn't see the point of shooting identical question myself :)
By far I've tried flushing a couple of times, the first one ~10 days ago from today seemed successful, however later on, the higher leaves started looking about the same as your girl's. Not all the leaves though, some got curled leaf edged down. Some a lighter in color. I've read a post from a guy stating that his only solution was proper watering, root temp of 22C/71.6F and basically overall conditions issue. This could be far from the truth, but still decided to share with you. Hopefully you'll get the bell ringing :)
I also thought it's a cal-mag issue myself, so i did light feeding after a good flush today. Will see how this goes in the next few days or a week at most. Good luck to you fellow farmer, may the THC force be with you :)