Too hot. Too much nutes. Too much Light. (I do 24/7, but only after the plants get larger. Those don't even qualify as plants yet... Also, the two leaves that come out 1st have enough nutes for the plant to grow for 1 month. I am not suggesting that, however, nutes at this early stage will burn up the roots. They are TOO DELICATE.

#1 problem with Newbies: Too Much of EVERYTHING!

(I did it all too! Don't take offense!)

Flush them with room temp clean water. GENTLY! Water lower than 80 degrees for sure... Then go to 18/6 so the cab can cool everyday. Temp should stay under 80 degrees I believe... Anyways... Good Luck. I will keep an eye and see how it goes!

Post more pics showing all you have going on so we can SEE!