Clones wilting and can't figure out why!

Hey guys, first time grower and cloner here. I cloned my plants about 3 weeks ago and the roots became visible just over a week ago. I removed the humidifying dome after a week and they were kept on a heating mat which was removed recently. They're also under a 45w led.
I had a mildew situation last week and had to remove 2 of the clones, sprayed the rockwools with hydrogen peroxide for the rest and kept them near a light fan for a few days to prevent the mildew from spreading.
The mildew didn't show up but there was an underwatering situation 3-4 days ago and over half the clones have been wilting since then.
I water them with clonex nutrient solution(these days twice a day cause they've been getting dry more often.) and removed the fan to prevent extra loss of humidity but haven't seen any changes.

Any thoughts, ideas would be appreciated.

 

Well, the roots have just started growing out a week ago. How long do you usually wait before transplanting?