Looks like it was given way to much food weeks ago, it curled the leaf tips and burnt up the leafs. These are all dieing now and you are upping your feed again about to kill off the rest of your leaf.
I'm using plant magic soil and using plant magic old timers organic bloom been giving it 3ml a litre and 1 ml of magnacal under a 400w has been giving 2 litres of water about every 3 days
I didn't feed anything at all until she had been in flower for about 2 weeks and then started at 1ml per litre and gradually upped to 2ml then to 3ml of old timers bloom
She was only given water during veg as the soil is ment to be good and not need to add anything until flowering
So do you have any advice on how to remedy the situation then please mate
