brown spots?!?!?! need help asap

not too sure whats going on with my plant... shes a month old, started from seed, growin in a bubbler system, ph 5.7, temp 82, under 5-26watt cfl's 6500k..... ok soo shes haveing some problems... a few leaves are twistin, some have brown spots, some at the edges and others all over the leave....

so in tryin to fix this problom, ive made sure to keep a constant ph @ 5.7(something that used to vary from 5.5-6.5) and more brown spots appear...

changed the water, mixed in nutrients (ecogrow 20-6-12 with trace elements and thrivealive b-1), adjusted for ph....more borwn spots

what could the problem be? nutrient lockout would have been taken care of when i changed the water... and ph has been constant.....its been a full week ans still more brown spots.....so should i change nutrients too ecogrom 15-7-12 ?

i just want the brown spots to go away

http://pic60.picturetrail.com/VOL174.../259086956.jpg
http://pic60.picturetrail.com/VOL174.../259086948.jpg
http://pic60.picturetrail.com/VOL174.../259086967.jpg
http://pic60.picturetrail.com/VOL174.../259086963.jpg
http://pic60.picturetrail.com/VOL174.../259086965.jpg

hows the airflow and humidity level?

Looks moist from the pics.

theres alot of airflow... vented growbox, powered intake and exhaust, with fan blowin over top of plant..... humidity always around 50 percent

You're overwatering and probabley overfeeding- look N heavy to me.

Love em less.

Could be leaf burn from foliar spray, mold, fungus... hard to tell from the pics.

Isn't a PH of 5.7 a little low? Tap water? Might consider leaving it out uncovered for a day or two before using it.

Maybe time to stop feeding for a few and flush. Low PH might be causing nute lockup.

That damage isn't going to heal just because you changed the water. Look at new growth to tell if there's an improvement.

What do your roots look like? Are they bright white or going brown?

pH should not be a problem- the poster is in hydro- 5.7 is fine.

I see a water uptake problem... get a pic of those roots!

epson salt and hydrogen peroxide :)

a grower's best friend

Epsom salts can be overdone.
Be careful using them unless you are certain that you have a Mg def, and even then, often foliar feeding is safer.
Just FYI