First Grow...2nd week flower-yellowing on lower leaves...any help?

Any experienced growers know what the issue is with the first plant? She's only two weeks into flowering and is losing color at the bottom. Is it N deficient, or something else? The last photo is the cloned top of the first and is just three inches shorter at this point. The strain is AK48 and they're 30 and 27 inches tall now. I know they're a bit stretched, but this my very first grow, so I'm happy to have gotten this far. I'm using MG soil and CFLs with a few single t5s. They've had two doses of Fox Farm Big Bloom and getting Schultzs 10-15-10 since back at week 3 of an 8week veg.

It does look alot like N def simply because your whole plant looks very pale.

BUt lower growth tends to yellow and die as the top takes priority.

I would just either increase your strength slightly to help or increase the frequency at which you are feeding.


J

So feeding every time I water would be okay at this age (8week veg plus 2weeks flower)? Okay to use FF Big Bloom at every watering now because its organic and mild, right? I know the lower leaves die off in flowering, I just didn't expect that to be this soon. The top leaves are still green though...