First Grow, 2 Plants, Hindu Kush & Fast Neville

Hey hope you guys can help me out,
here's pretty much what's going down.

400Watt HPS light, Fan, 2Gallon pot size, in my wardrobe,
Day 12 into flowering.
Temps with doors kinda open is around 25-27degrees C
Can go up to 35degrees C when completely closed.
Don't know humidity, doesn't ever feel humid in closet, like ever.
Fans the only thing giving them some sort of air circulation.
Don't know and never tested PH of soil, I added a fair bit of
perlite in there for extra breathing room.
Not really done any trimming or pruning to them, only a few at the bottom
Some random miracle-gro (Azalea, camellia & rhododendron) soluble plant food
...Is this shit any good??? ^ ^
I water my plants every two days sometimes three, they get 1litre of water each and a tad of the miracle-gro substance.
I also have "BIG BUD advanced nutrients for the last couple of weeks of flowering
(again is this shit any good?)

Miss.Neville is 100cm tall and Miss.Kush 70cm

Now for the questions which most of you have answered maybe 428times?

Yellowing of leaves the moment, keep getting worse?
Sativa can't really decide weather she's happy or not, and Kush is just not feeling like lifting the big heavy fan leaves anymore
Looks a bit upsetting to me...
Any suggestions on anything you see in the pictures???
As a dodgey, shadey, off the cuff grow setup, and all information given will i get any sort of yeild lol ?

Any sort of contributions and suggestions negative or positive on my grow-journey will be much appreciated!!

p.s i'm a poor man

kush looks like its getting underwatered. the sativa looks fine though.

Thanks for the quick response, see under-watering was something i considered, but only a thought, do you have an idea of how much i should give it? 1.5litres??

small pots, too much heat, probably not enough water, and dear god man look at the amount of perlite on the top of your soil...airy soil is a good thing, but if you go overboard you'll be watering 2x/day...and with how small your pots are...you are not giving them anywhere near enough water

The kush looks thirsty and like she may be having pH problems. Do you have a meter? Soil pH meters aren't that pricey.

Yeah the plants are a mild representation of how fucked i am
However, These seem to be good pointers, soil/perlite ratio is 80/20, just looks pretty insane i agree!