Brown spots and yellow tips in flower, started around wk 8-9. Thanks!

It's a blockage, it also has excess nitrogen. You have solidified salts in the roots and they can't eat properly. It's like there's a filter that prevents them from feeding correctly. I use a salt breaker with the fertilizers to avoid this common problem (don't confuse it with a salt drainer, they have no relation in their use). Cheers, my friend. Much løve 💚

Thanks m0use. I ph every time to 6.5 or a little under but I should prob be checking my runoff, I guess? Could it be under-watering (I typically water on a WxFxW schedule throughout)? I also used Recharge up to about wk 9. Could it have something to do with cutting out 4-4-4 for the last top-dress, and only using 484 and Fish Bone Meal? So maybe underfed? I'd love to go with DtE but I've gotta figure out what's happening in mid-to-late flower- same thing with a 1g CDLC last month. Thanks again, and I will be switching back to 18-6 with my next run but I honestly think this is something else- showing up so late in flower. I also have read about the usual suspects and causes, but my last idea is that I scratched up the surface of the soil because the dry amendments had hardened some on top of the soil- and as I type that, both of those things seem wrong. Thanks again m0use and anyone else with some specific advice- I understand people feel strongly about a 24hr light sched so- message received! 😬🙏