Seedleranswered grow question 19 hours ago Yooo, hey Harry!
I assume you're newer, please don't take offense, i/we just wanna help (:
Soooo as 00110001001001111O said (oof, i typed that out) i think it's a nutrient lockout (i explain that in a second) Can you see some leaves are VERY dark green? glossy almost crisp looking? some tips pointing down doing the eagle claw. looks like the plant got a looooooot of vegetative nutrients even tho she is now in flower. So i guess you either still give veg nutes(which can be okay for some brands but the plant in flower needs a different amount) or you have some nice cool easy all in one soil(or anything else that is giving long term fertilizer to the plant) which would be problematic because if you now feed flower nutes and have the veg nutes also, it's just too much - speaking of nutrient lockout
A nute lockout happens, when a plant gets fed sooo much fertilizer (we just love them and want them happy :/ )it just CAN'T up take any nutrients at all or just some specifics which can cause many many other symptoms. like underfeeding.
Please consider doing a full diary here on growdairies, people can help you even better then, when we see everything.
If all of what i just said rings no bell at all, maybe it's just a pH problem. If the pH is too high or low, nutrients also can't be uptaken, or just some can and others don't. Then i would check the pH of the RUN OFF!!! water, this means the water that comes out of your pot, when you water. its nice to know what pH water goes in but what comes out is waaaaay more important.
Possible actions: double check nutes, nutetrient feeding chart (you can google it from your brand) and pH
Changing nutrients, get a somewhat decent flowering nutrient(doesn't have to be expensive BioBizz,Hesi,Plagron,Canna are decent brands imo)
Check Run off, and water only with pH corrected water (youtube)
(could also be just a calmag problem, but i daubt it, considering the toxicity signs)
I hope something of that does help, good luck with your grow, you're a wizard harry 👻