The leaf damage looks like signs of root rot, would check into this 1st. If everything looks clean and white, check into PH, if that seems ok, I would clean out your system and go with a fresh PHed water and give it a few days before feeding them.they were just transplanted in to hydroton last friday not the one that just passed i tryed to be gentle and they grew right away with no signs of stress took about three days from the transplant to the length in that pic so i dont think i damaged them too bad how ever there is a couple above the hydroton that was just way to high i couldnt cover but looks like they shriveled up and died off now
see if you had soil I could tell you to build up the soil around stem but man clones arent accessible to me in a illegal state good luck bro! Soils much easier and as far as ph goes don't get to locked up into it it may have its place in hydro etc but at the end of the day we got to remember they are weeds and need little care to grow things.first time i tryed to turn my fans on in my room my freshly cut clones i had in my bubble cloner they fell over and died by morning, and i have 6 day old clones with nice root bumps sharing the room with these 2 older clones that why i havent kicked on the fans yet, the fans would kill the humidity and my new clones wouldnt make it,once they root i was gonna give it a shot....my new clones look like shit too by the way lol they are in a race for time to root before they eat all the greenery i dont think i misted enuff