Plant Probs.. Any Advise?.. (PICS)

Hey everyone..
I use FFOF soil and Full line of FF Nutes..
There all in veg right now And the leaves are having problems and thay don't start off to bad but the older thay get the worst the get..
Its almost like little burn marks or a Rust looking color.. here are some pics..
any advise can help.. Thanks..
I can get more pics if needed..
Ones strains GDP and the others Purp Bagseed..

huh im using the same line up, dont have that tho....wat lights u using???? how often watering?? do u spray em???

Im using Floros.. And I sparyed them once with a 3 in 1 Spary ( Not while Lights were on ).. I water once or twice a week..

i would recomend that u stop sprayin fer a lil, c wat happens, and mayb try watering with littler amount of water, but just more often, but wait fer the soil to completly almost dry up b4 watering. floros? how close?? giv it a few days c wat happens??

I never normally have probs with my watering.. And its been like this for a few weeks.... my lights are about 6-8 inchs away.. Temp 71 RH 32%, well Ventilated..

those lights should b about 2-5 inches away, they arnt hot, i use a 150 watt hps, i keep it 6 inches away!! u need to go closer! and yeah dont give them a schedule fer watering, just water as need cuz as they grow they eat more an more though out there lifes, I use the 'pik up' way of watering. everyday ill pik the plant and pot up and see wat i weighs to my thought, then wen its wet, do it then dry, do it again dry, soon u can tell just by pikin it up if it needs soakin!! its kool i got it down now!! hahaaaa

Lol, Yeah thats how i water mine.. Theres a big diff in weight..

some white spots i notice on the tops of leaves. check under the bottoms of the leaves above for mites. also I noticed the soil pulling away from the side of one of the pots which seems to show lack of timely water? Im new so take my posts with a bit of hmmm..
I love this site btw filled with so many awsome posts pics and knowledge.

I have no Bugs/Mites... and my waterings fine.. Thanks tho..

what is your ph maybe mag lockout

My ph was around 5.2 to 5.5..
I did a Flush and got them all to 6.5 last night so we shall see how it turns out..

damn thats low! yea that flush should help

ff liquid ferts r not ph balanced and it will drastically lower the ph of ure nutrient solution so i wood feed a little less often and feed bout half of what they suggust until flowering then at 75% ideal ph for soil is 7.0