too much water is debatable for a couple of them. The ones in soil show that your soil is bad. I would bet PH. 2nd bet would be high nutes. They are most likely too gone to be saved. Next time if in the U.S. get you some promix. This is about as clean and nute free as you can get. Hell I even start them in Miracle grow seed starter soil with 100% success as long as i neutralize it with some tap water first due to very low ph. Just remember, to start seeds only 2 things are needed. Neutral medium and clean water at a ph of 6-7. If you planted seeds in soaked thru medium, that will be fine. Just make sure you wait till soil is almost dry before you water. Ive always soaked promix thru (cant even remember the last time I ph checked promix because ive never had a bad batch), pushed finger down in soil about half inch, placed seed, and grabbed some wet promix off the side of the cup and sprinkled it on top until it mounded up(do not compact it on top of seed, and mounding it assures the area around seed will not dry out) like a hill above the seed. Then you just wait. depending on conditions I may not even water the seedling again for 4-7 days. A lot of water does not ruin seedlings as much as a high frequency of watering will. BTW if you decide to try promix, feel free to remove some of the perlite for seedlings. Most seedlings depend on water and the oxygen carried by it to start. It does not need aerated soil. And for crying out loud do not buy lightwarrior by Fox farms. It may be a seed starter but not for cannabis. all of the oyster shell in it keeps your ph at 8.0 or higher. I have a thread I just put up experimenting with fox farms lightwarrior and how they cost me $200 in seeds