I absolutely would not give up on them yet. I f you are overwatering stop. The cubes should be damp to the touch not wet. Stop taking photos of those poor little things, keep the rooters DAMP, not soaking and given them a few days to pop their first leaves then rejudge. PS--I did the same thing, planted ten, had 8 buckets, tossed 2 smaller seedlings then lost two from the pots later. Keep the extras for as long as you can. I find with the RR's I only have to water every other day or so unless they are on a heating pad or something. Pour off any excess water left in the bottom of the tray. They look far enough in their little holes to me to be fine. Good luck