seedlings in need of rescue?

[coirchoir]

- just deflasked 2 sets of seedlings - day 6/7
- used icecube trays with spg moss moistened with very very diluted fertilizer;
- placed the trays in zipped clear plastic bag (comforter cases)
- watered them on 2nd and 4th days and may have gone overboard/overwatered
- looks like some of them were too tiny anyway, and roots now seem to have disintegrated; the bigger ones too look like some of the roots have black spots, and leaves are browning.
- on day 5 I aired the most sick looking tiny ones and relocated them en masse w/sphag moss on a tray layered w/peanut packaging
- should I intervene and do something to the others or leave them as is, and do roots get looking worse before they get better? is it too early to say?