Leaves drooping and yellowing at beginning of flower

I would say over watered and make sure the pH is right. She looks healthy just struggling to breathe.

This is a coco grow totally different then what you are being told. I grow in coco. Heavy irrigation is key. Coco is inert with no nutrition. So you are feeding them out of a bottle now . Your ph in coco is extremely important. Should be 6.2 going in and comming out. Coco is hydro in a potter. So it must always be moist, with feed and ph inine. If ph is above 6.3 you will experience deficiency signs. Coco also has a issue with absorbing calmag so it is required in coco grows unless using a nutrition high in them for coco. I have grown in coco for many cycles. It is not like the soil advice they are giving. Coco don't work right like that.

Yes, it is a deficiency of trace elements. A dose or two of soluble trace elements, available from any garden centre, will solve this. The fertilizer you are using has adequate phosphorous but not quite enough potassium for the flowering stage, this might be something you might want to consider upping. A good general health booster is a seaweed tonic or seaweed extract, also some humic acid, fulvic acid and amino acids will also boost health considerably. It is probably too late for addiny any mycorrhizae, but I urge you to use them in your future grows, the results are all positive, with plant health and vigor accelerated. Mykos from Xtreme Gardening is my recommendation, but there are others, like Great White Shark. On the face of it, they may seem expensive, but you don't need to use much and the results are worth every cent! Worm castings are not really a fertilizer, they have no macro nutrients, they are more of a plant and soil tonic that feeds the soil microbes. So, basically, they need some more food, with particular ingredients (trace elements and potassium), could benefit from a health tonic boost and there is no amount of training that will cause what is occurring with your plant and it has nothing to do with under watering, your light or your fan, to answer all your questions! Hope this helps, Organoman.

Hi! Interveinal discolouration starting from the middle of the leaves is a clear indication of a lack of iron. But because you use a nutrient program who is not designed to match the specifics needs of cannabis, you may also have zinc and magnesium deficiencies too…

Everything mouse said plus I'd add, you are using a fertilizer that's not high enough In phosphate. And I think your lacking magnesium.

Hi. How much water are you giving her?