Help

My little seedlings cotyledon are turning black. I have them in a 1 inch rockwool cube they already have roots growing out the bottom but the the cotys are really black. Any advice

i dont know what going on, but ull never get responces with a title of "help". thats the number one thing that bugs me, sorry i dont mean to attack you,but for everyone else, please title the thread so it gives an idea of the topic

Ok sorry i'm just learning here

more info needed.... pictures will HELP us to diagnose it if we can