Seedlings, as you know are delicate MF'ers. Hulkster with the lights to close could be a factor. Also peat is real acidic. I've seen 4.0 PH with peat. I'd test the medium for PH and EC. It's simple. Use distilled water to make a slurry and check it. Sumpin ain't right ! There is such a thing as "bad seed" . Crop King experience. They wouldn't even germinate! Laundry room ? Do you run a dryer in the laundry room. If you had good success in the past, you more than likely have changed your mojo in some way. You'll get back on track !! Peace