400W Super Lemon Haze Pics attached.... Action

First off I would like to say this is my very first grow, any questions/comments/constructive criticism is appreciated. I do not check my Ph or ppm or anything like that (dumb I know, but im just getting into it,, gathering tools and such. Next grow i will) I am using a 400W light with a 23W(100W replacement) Cfl bulb just because it was laying around. These plants are being ran using "bubbleponics?" 4, 5 gallon buckets with 6" net pots a Eco Air 4 pump. The nutients I started with were SuperNatural Gro Aqua and Bloom Aqua. I recently ran low on it so decided to try other nutrients (hoping for better yield) I am now using General Hydroponics flora series. (started on that 3 days ago,, if anyone could steer me in right direction for mixing/adding to the water i would appreciate it.) This is a 4x4x6.5' tent (ebay) I also have a 6" inline fan pulling hot air from top and running thru a homemade charcoal filter, no smell in the house which makes me happy. As you can see in the second picture my plant is yellowing up near top and producing small leaves that are drooping,, anyone have any ideas? I was thinking it wasnt getting enough o2 to the roots? the roots are basically filling the bucket. Or humidity which im getting dehumidifier this weekend.

The 2 big plants were started on sept 12th on cfls on oct 7th i started on hps and 12/12, the other 3 are idk how old lol, younger then big 1's

ENJOY! COMMENTS WELCOME!

Hey nice lookin set. I actually havent gotten the Ph meter yet lol, what are you using to cool the air? because my room is REALLY going to get hot this summer.

And I actually have a PPM meter haha I thought it was a PPM/PH dunno what its called but its cool. got it for maybe 20-25 dollars i think.