plant problem please help

one of my plants has a problem not sure what it is i looked at the faq and not sure what it is i have added some pics if anyone can help that would be great o by the way i'm using a drip system earth juice grow and fox farms big bloom thought i might have a root problem so i'm treating it with sm-90 nutralife but why would only one plant have yellow leaves there is one other plant that looks like the bottom leaves might be turning yellow

Looks healthy other than the few leaves.
I think may be root rot. (not sure though)
What is the nutralife?
I use water with low % of h2o2 (peroxide)
I use this to flush the plant.
If your plant develops root rot it will not take up nutrients.
Do you have any co2 going?

Also if this plant is getting the same nutes ( amount) as the other plants, then it may be something like root rot.
Kinda looked like nute burn first glance.

Check this website out, it has helped me
HEAT STRESS
Thanks to Spittn4cash for the link..

i am using h2o2 nutralife sm-90 is for root rot and many other unwanted things look it up on the web i got it from the local hydro shop

Hi Crow..

tough to say but there are a couple things to check..

Me personal.. I would change all the water in my reservoir and make sure to fill it with the perfect pH and ppm water... probably 5.8 pH and 300ppm nutrients... and then i would slowly raise the PPM (nutrients) to 600-100 over the following 3-10 days...

I would also add an air stone to my reservoir..

have you looked at the roots.. do they look healthy and white?

The good news is, your new growth does not look stunted.

cheers

well they looked a little brown a few days ago but i changed the water and lowered my nutes like you said i have air in my tank all the new roots are a good white and there have been more and more of them for the last few days do you think the yellow leave are just from the few days that i was not treating the problem i think this sm-90 i got is working great i just wanted to make sure that the yellow leaves was from the root problem and not something esle o one more thing i have some super skunk going in a dirt grow and some of the leaves have a litter green spots on them but for the most part the leaf is green what could this be and is it a big deal could this be a light problem date is not right on pics cam is fucked up the first ones are the old pic of the roots the last to are the new ones