My first grow box!! Pineapple chunk, Barneys!

Hello everyone, Im a swedish guy who just started his first grow, Problem is i might have thought myself be far more better at building my growspace then i am. My idea was that i would purchase an seed that wouldnt grow as big. So i ordered Pineapple chunk from from Barneys, Because of my lack of space i orderd 5 seeds thinking that mayby the best 2 ill keep. the grow area is an built closet like an furniture.
Height is 124 cm and bottom is 52*50 cm. My intensions isnt to grow and take sticklings and such, When this has ended ill buy some other seeds and try something new.
Anyway i thought i had thought of everything but its getting to warm (i have no cold air to lead to the box)only the air from the apartment.
I have 3st 12 cm computer fans for cold air? i have an bathroom fan for sucking the warm air out? and i have an small 8 cm computerfan to cool the lamp and for blowing that heat from the lamp to the exit sucking fan. LOL. anyway i wonder if theres something more i could do? im thinking of giving this box away to a friend for some % when he finish and building an bigger box. but for now i just hope i wont burn them? or to dry air? And can someone please tell me why one of the plants have thin light green leafs, and the other more bushy darker wider leaves? It suppose to be the same strain? Is one sativa and the other one indica? They Look like siblings but not like twins! My english isnt that good. But i want to get all of my questions all the same time. And a other thing do you think a should cut the top of the plant? To get to tops?? what is best?? 4 days in bloom.

How do you post pics?

Peace out from sweden!!

This is the closet from the side!The box again now closed! This is my babys, The three things you see is the three fans blowing cold air in.This is the top of the backside, With covered charcoal, its the backside of an bathroom fan. down side bottom backside with three fans.this is the one with bigger leaves. this is the same one with bigger leaves. this is the one with thinner leaves. the thin one again.. the height of both is the same like, the thin one is 20 cm and the bigger one is 15 cm.inseide the box, the thins to the left is a small fan blowing towardas the lamp.

4 days into bloom i woulden`t try to top, a little late, usually want to try toi top well beafore flowering my friend. but otherwise decent looking plants

Thank you mate, Just sence yesterday alot has happend. Alot of new leaves coming. Should i cut the lowest biggest leafs? or are they sucking in the light for the rest of the plant? and they are really getting bigger to the whole plant (if im not mistaken) shows new leafs all the time. And how long before i can see if there female? im getting worried they are male. Should i already see the string between the stems or does it take some time like until the flower shows? and one more ting how sensitvie are they to touching??