Newbie Need Help Diagnosing This!!

Hey guys! My little plant is now 12 days old. Growing in a 2x2x4 box I built and painted white.
Light: 32w Feit electric 3 spectrum LED (upgrading to ms ts1000 very soon)
FFOF/perlite mix about 60/40.
Box isn’t totally sealed up, that’s gonna be done on payday.
I’ve seen little bugs in there and I’ve neemed the box once, and the plant just today.
I went to check on it this morning and noticed these little brown spots. Sorry they’re so hard to see, I’ll try to get some better pics after work.
Don’t know what they are!! Any help is appreciated
Edit: water with distilled or tap water, kelp extract every 3 weeks (only once so far)

Maybe spider mites. The brown parts almost looks like a type of fungus or something. I try not to get my leaves wet. I'm still a newbie though, so this is just a guess.