So what's wrong with these?

Ok.. i realize these look pretty bad.. just wanted to see what's going on with them.. this is a grow that i already know is never going anywhere, i'm only keeping it going to learn... the closet they are in is at about 72 degrees and only around 25% humidity which i know is way too low....

I've been watering just a bit every couple days, though last time i dumped a bunch in to see how it goes (AFTER i saw the damage in these pictures) they are in MG soil so i'm guessing nute burn but wanted to run it by you guys for another opinion since i am a huge newbie after all

I'm also aware that these cups should not be clear and are likely too small... i'm just sorta torturing the plants for my own knowledge

Shouldnt be feeding nutes right now ...
They will definitely die if you keep torturing them by burning the shit out of them with nutes.

looks like major nute burn to me but I'm still a noob too
MG is too strong for seedlings IMO

ok, just wanted to check that- i alsoa ssumed it was nute burn and once i have a proper location set up and I'm ready to try another grow i will not be using MG