Ok so I found a neat place in my area that sells everything I need from here on out

Lights,grow mediums... the works.... So I got my self a thermometer and some nutes I think I will try out soon. What do you guys think though? Or the times I should use these nutes.
I honestly don't have a solid solution to venting this closet. I have some ideas but they change every time I think about it. Was gonna put a vent at the bottom of the wall and some exhaust fan sucking air to the attic, add a door and seal it tight. Some fans circulating the air. Then adding some type of ionizer in that room. The room is offlimits to anyone aswell.
But I'm looking at plans to make 2 more grow boxes so this room is gonna be pretty modified when Im done.
Day 5
I seen some roots peaking out today and totally forgot to grab some extra cups to house these babies until transplant. What color should I get ? Anyways I recycled some old card board I had laying around to shadow the roots until tomorrow. I hope that amount of light exposure for several hours today wont hurt the seedlings.