Well where does your intake fan draw air from? If it's from inside your house theres your answer, draw air from outside. Also I wouldn't run two fans I would just connect an exhaust fan and run a duct from outside into the tent so the exhaust fan draws the air in.
I know you say running ventilation out your room is sketchy but I've done this before lol. But you could get a can fan and a can filter 33. Also get one of those stupid little side by side dual window fans for like 20$. Put the fan in the window close the window. Then to the outside it just...
Depends on how big they are if they are still like the same size as when you clipped them I wouldn't count it as veg time. If they've grown I'd say it was veg time. I mean what you count as veg time doesn't really matter though You gotta decide how big they are now and how big you want them when...
Also the leaf tips changing brown is normal really if they are wet and brown they are rotting dry and brown not enough moisture either way they will turn brown and recover when they root and you put them in a normal environment. The plant is feeding off its leaves cuz it has no roots. They'll...
IMO why don't you just go buy a dome and heat mat it's like 20$ lol ... But if you insist on DIY keep the lights on 24/7 (DIY or not) cuz you basically answered your own question light create heat heat and water create ... Humidity. Also if your worried about your DIY box melting you should take...
I mean honestly you can fit them but how long are you vegging? If your doing like a 3 week veg from seed I'd say do 1 gallon pots for 12 of them but if your going for bigger plants you couldn't fit 12 . Also consider that in order for you plants to grow that soil needs to be ... Moist . So wall...