Yellowing and brown spots on leaves - Advance Nutrients

I am at the end of the 5th week of flower and some of the leaves are turning yellow with some brown crispy blotches. I am currently using Advances Nutrients Micro-Grow-Bloom with Dutch Pro Explode in Coco-coir and feeding her what is recommended on the Nutrient Calculator with 1ml/l of Explode, the ppm is usually around 1000 before the explode then around 1200 after. The last time i watered her was just ph corrected water. Could anyone tell me what needs changing or what should be done.Thanks

Sorry for the pic quality, flash ruins the image. Really could do with some advice here.

dude your plants look like they need nutes for sure. there must not be no more in your soil if it turned yellow. u could just give it a regular feeding and take dead leaves away.

Feed the bitches.