Purple Buddha Kush and Magnum CFL Grow

I think it's lacking nutes, seems like you may want to start a light feeding they are starting to grow up. A very light feeding 1/8 strength or 1/5 strength. Seems like it's it good health, just a lack of stored nutrients are killing the eldest leaves on her. This is where you will gain lots of experience sort of experimenting and seeing what works for you and the strains you are growing. Cheers mate

Every 4 days shouldn't be over watering so it could be as mentioned above. Try a light feeding and see what happens.

Kk guys! Cheers!

UPDATE
WEEK 4:
Magnum is worse, watered her yesterday with nutes for the 1st time, let's see what happens. No signs of flowering for Magnum yet.
Purple looks healthy i think

UPDATE
WEEK 5:
Got my 250w hps today, i think everything running ok.
Magnum started flowering i think ( i saw 2 lil pistils comming out)
Purple show no signs of.. "purple" but looks good

UPDATE
WEEK 10 (day~72 since germination)
(the one on the pics is Auto Buddha Purple Kush)
Magnum only appears on 1st pic in the background

How many weeks you think until harvest? 3 more weeks?
Still no real sign of "purple"!