Durban Poison

yep you had a bunch of issues including N toxicity (dark green leaves with burn) and you're right about calcium deficiency too , you can tell from the spots on the leaves. Why did this happen when you have a good PH and enough nutrients? basically because of overwatering , you can tell from the puffy leaves, and especially the puffy space between the veins of the leaves. Two things you can try to help the plant recover : first cover your buds with some celophane and make a calmag spray 6ml / L and spray until the leaves are dripping wet (do this at the begining or at the end of the light cycle) , either that or add cal mag every watering. Second follow a stricter wet dry cycle. use the lifting method to gage when to water its better and more precise than the finger method. i wouldn t start the flush just yet, give this lady some time to buff up and recover. Hopefully you'll still get a decent harvest ! hope this helps ! 🚀

hey there,i've done some research and maybe you got some deficiencies going on there,in my opinion ,you should look at this table https://www.alchimiaweb.com/blogen/wp-content/uploads/2015/12/KRuFnY4-1022x1024.jpg ,if your leaf has some strech marks ,wormlike brownings on the leafs then maybe its some sort of bug wich eats the plant from the inside of the leaf,but that's hard to develop there(LEAF MINERS),it looks like a cal-mag deficiency in the late stage but it's a bit tricky becoz even potasium late stage deficiency can lead to those sort of markings,but for sure that's not a heavy nute burn to be honest ,check here --- http://www.ilovegrowingmarijuana.com/nutrient-burn-in-marijuana-plants/ ,hope this helps you clear out the problem :D i would bet to add some cal-mag trough the process and reduce the bloom nute a bit just in case,4ml is more than enough ,happy growing!!

@mrslarimar is correct about the dark green leaves. But in the last couple of pics I also see yellow dots on some leaves. I’ve never dealt with this personally, but that looks like it could be spider mites. Have you checked the under side of the leaves? Do you have good air movement and circulation?