Greetings farmers!! It's been a long time since I've posted here. I hope you are all healthy and well!!

Just recently i decided to try some hydroponics. I made an Rdwc system and now trying to figure out, how to use it correctly.

My system works just fine(i think so), the nutes i using are terra aquatica tri part. Atm i following first roots schedule, which is 0.5ml of every each per liter. Also im using TA pro roots stimulator as mentioned in TA schedule. Water im using is RO. Ph around 5.7 and ppm around 350. Water temperature around 23. Air pump is 2400 lt/h for 4, 20 lt buckets.
My lights are LED Lumatek 465 zeus pro c.
Seeds were terminated in rockwool cubes till roots showed up, after placed in pots with hydroton. The rockwool cubes are not on the bottom of the net pot, but on some layers of the hydroton.

On my pics those are actually different plants. I replaced some badly damaged plants with newer seedlings, but all of them are wilting.
I just can't understand why this is happening. Net pots are like 2 inches above the water. Also i can see some roots and there is no pythium. My lights were at 25%, them i turned them on 50%, the distance between lights and plants is around 10 inches.
I poured some water a couple of times on hydroton, tried to avoid the rockwool area. Looks to me like overwatering, but i have no clue. Is it possible that rockwool is choking them, I don't know...

Any info would be super appreciated Thank you for taking your time and reading