You don't really look deficient my friend just naturally fading and it looks good. Unless you use RO water then I recommend using CalMag from start to finish. I use a filter that strips the chlorine from my water and it also gets rid of some of the calcium and magnesium so I'll also supplement CalMag throughout my grow in small increments so it doesn't hurt but if you're using tap water, chances are you're getting enough.
Plants look good. Maybe throw in a little Epsom salt to boost her magnesium if anything but all in all she looks good.