too much nutes

2 tents going and this happens in both. One month into flower the middle to newer leaves start to do this (see pics). Ph is checked, ppm is on low side. It is more pronounc ed on certain strains but happens to about 25-30% of plants (600w/1000w HP's) Anyone?? I do have big jumps between water...

HELP! I have a plant that was about 1-2 weeks from harvest. I think I added too much nutes or perhaps too much light, either way all fan leaves turned brown and dried and died, the sugar leaves are now drying and dying. I've reduced light to 10/14 to try and speed the ripening of trichs. Can...