New growth is light green, growth has slowed

Growth has slowed tremendously and new growth is very light green, I believe I may have a deficiency but can't find anything that looks quite like it.

check your ph, give abit nitrogen, buy calmag whicuh is a good source of calcium and magnesium and make sure your plants are not to close to the light if you are using a high pressure sodium.

what kind of grow medium and size pots are they in ?

and do you add Ca/Mg to your normal NPK nuts ?

I thinking, either a repot or some Epsom salt, or just more/stronger nutes/Nitrogen .. but need more info please ..

your temps mate? looks cold with those purple stems.

Grow journal: https://www.rollitup.org/led-other-lighting/578477-led-cfl-closet-coco-grow.html

Using coco fiber as my medium
Not sure on the exact size but I'm using a grow bag, I believe 3-5 gallon?

I actually think it may be a temperature issue. Basically I am doing a closet grow and being in an apartment I can't cut any holes in the walls, so I don't really have any ventilation. With the door closed my temps get up to 85-92º F so what I did is open my bedroom window which is about 20ft away from the closet door to let cold air into my bedroom then I cracked the closet door. My temps got down to 75º by doing this so I was right where I should be but I noticed that my hygrometer said my low temp was 70º so I'm thinking it may have gotten too cold in there, I closed the bedroom window and left the closet door cracked the temp is hanging around 77º now which I think is ok.

I'm starting to realize I may need to get some ventilation soon I was thinking since I can't cut holes in the walls and I don't have a lot of money to spend on a tent I could just buy a new door for the closet and cut holes in that for ventilation then of course put the original door back on when I move out.