Stunted Growth - two weeks old

Your soil is wet as other mention and the roots don't have almost any air inside as the soil is very compact and make sure you ph is about 6.5. For seeding is best to use coco as its soft and the new roots can grow easily. Make some hole on the bottom like 5 dice and get some 6 inch fan on slow mode and let the air blow, but not directly on the plan, but on the wall and the air will bounce to the plant helping to get out some moisture. They should survive, but your grow will now be extended by 1-3 weeks 😊👊👍

Too wet. As the others said, add a few holes in the cups. Balance the Ph. Good luck!

Your drowning your roots. Put some holes in the bottom of the cups and let them dry out. Also rockwool is not the best to start babies in when their going to be planted in soil, unless you buffered the cubes first to 6.5.

Until the plant is dead, it can always be saved. The problem you're seeing is the result of the pH (as you recognized)... But they also look a bit overwatered - let the soil dry out between waterings! It also doesn't look like you have any perlite in the soil mix and this is also critical to keep the soil aerated for the roots. Right now, to combat that, you can add a small amount of H2O2 to your water (1-2tsp of a 3% solution to a gallon of water) - this will bring oxygen to the roots. In a week or so, start them on 1/4 strength nutes (keeping up with the H2O2) and they should respond nicely. Finally, when you transplant, make sure you've got a good amount of perlite in the soil ... Good luck!