marijuana yellow leaves, rust spots, burned tips problem HELP>

im having problem with my plants..
soil MG organic with 30% perlite
nutes 1/2 teaspoon of grow big and big bloom 1/2 teaspoon last 2 watering
temp stay between 65-79
humidity 39-59
i have good air circulation
light im using 400w mh, 150w hps and a 43watt cfl
i have to go to work but i will add mroe info when i get back you in advance...

My girls are looking the same I think you got nute burn

your using a soil with time released nutrients and then adding nutes on top of that, yeah,, I think there a little fried.
try flushing with plain water, 3x the size of the pot.

You can flush out a lot of the time released nutrients if you run a ton of water through the pot. Normally for flushing they recommend 3x water to soil (so if your in 1 gallon pots, flush with 3 gallons of water), but when I flush out time release MG, I flush with 5x water, every watering for a week or at least 3-4 times.

i been using foliage feed(grow big and big bloom) and the problem(rust spots and yellow leaves dying) with the leaves stopped. i tested the ph and it was 7.1, i think it was too high and probably a couple of nutrients where partially lockout, i flushed today with 5.5 ph water.

just an update, my problem was high PH. the girls are doing fantastic, only problem is have spider mites, but im not worried, they are easy target!!.