Noob growing help

there 2 weeks old offically are they small . Well anyway I got 8 flower pots some miracle grow, 2 fans, spayer bottles. I have my plants growing in a contained box but I think for co2 purposes I should keep it open. I have 3 flourecsnt lights 1 black light and 2 white and what I hope to be a CFL. A couple of my plants leaves are turning yellow. the temperture goes from 70's when open and 80 when closed I have 1 vent whole but I read somewhre that fans cut the co2 so I dont know. But look at me pics 2 and tell me if you can help.

Ditch the foil man

Why doesnt it help

Not really it creates hot spots and burns the plants.
Mylar is much better. Or even flat white paint.

Mylar is the best reflective shit u can get pretty much without paying an arm n a leg

Mylar where can I get that

most home and garden restoration stores such as rona, home-depot and stuff like that sell it. its not too too bad in price either.

Whats a good temp will they grow fine with my box closed.

you should always have a ventilation system set up when growing with more high powered lights, it helps to control the oxygen and heat levels.

Yea but I got flourescents I can hold them in my hand. Its doesnt ever go above 90

Ventilation and air flow are as important as soil and light.