Seedlings cotyldons and leaves turning yellow/brown

They do look better Pazzo, good job.
Keep us posted on they`re recovery.
ccb

shouldn't young seedlings be started with flos, until they have three or four set of leaves it seems your light is way to strong for the babys.

i am having the very same problem m8 apart from my idiotic friend decides to kill my seedlings of wit fert lol still gt 3 left tho just ease of the heat if u can i bring my plants out of my attic around ten o clock evry nyt n leave em on a windowsill wit the window open a tiny bit. nothin beats fresh air from the outdoors lol safe yo

hey man i had the same problem i am using a 600w MH and i moved the light away from 1 foot to 2.5 and the seedlings bounced back, and when the roots are well established move the light closer. about the humidity if you put ice on a BLACK plate or black plastic tray in frount of the fan, it will bring the humidity up by 30%....

Cooler temps will help. Also, no fert.

Take a piece of plastic food wrap and make a small tent over the cups. Use sticks (3-4 inches) to lift wrap over plants.

Mist frequently. The small roots and leafs can't keep the plant moist enough to stay alive much less grow.