Help with--Brown rusty colored spots leaves

[BudSmoker510]

Hi guys
I have a problem with a few of my leaves with rusty brown colored spots all over them.
I'm doing DWC with air stones.

I have included a few pictures to give you guys a better idea.
Any advice and tips would be appreciated..
Thanks in advance.
btw
I'm in 18/6 light cycle (third week vegging)
Nutes:using 1-1-1 g-m-b
1 tbs of Cal/Mag per gallon
1 tbs of fossil fuel per gallon.
my staring ph is at 5.4 and with in a week it raises to about 6.8-6.9
My nute PPM is at 920.
My H2O baseline ppm starts at 450ppm!

I'm thinking it might be the Liquid Light I sprayed on the leaves.
idk..
http://img718.imageshack.us/img718/7177/imageoap.jpg
http://img818.imageshack.us/img818/2673/imageqqg.jpg
http://img232.imageshack.us/img232/4416/imageee.jpg
http://img708.imageshack.us/img708/7339/imagekdx.jpg

[tikiroom]

The first thing I would focus on is your ph. You want to keep your ph between 5.5-5.8 for hydroponics. Allowing the ph to swing as far as you have can create unwanted stress and lock-out some nutrients.
Start by maintaining your ph for about a week and see if things improve. The already effected leaves won't get better, so just watch the new growth.

One other thing, sometimes a fast rising ph is a sign of algae or slime growth in the reservoir. So also keep an eye on your res for signs of this.

Hope this helps and happy growing. :hippy:

[polishpollack]

If you're bucket fert is good and you feel confident in it, I wouldn't spray anything on the leaves.

[BudSmoker510]

Thanks for the graph!
I'll try and keep my ph @ 5.8

I won't spray anything else on the leaves.

I'll keep you guys updated.