Ya Drowning the Seedlings bro ,I would have less water un that you got them in just the bottom part of the plants about a cm or two of water ,Add some sort of air into the water before you do anything,Perhaps Air rings around the bottom of each pebble pot,If your growing in dwc then lower the water level and get a stone in the bottom of each The tub.The wilting of each one of the seedlings looks like it caused by over watering,If you was just to pull them out for a few days they would pick up ,If you carry on with that amount of water around each one you get root rot