[SIZE=10.5pt]I think they're getting too cold and the roots are getting too much water and not enough oxygen and warmth. If you still have seeds, I would start new seeds because new, happy growing seedlings will probably overtake those quickly, with less hassle, and with less risk of ongoing issues. Seeds that start out unhealthy are often poorer performers no matter what you do later and sometimes will fail to thrive at all. These may already have root rot or other significant issues.[/SIZE]
For $10 at home depot you can get these.
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https://www.homedepot.com/p/Miracle-Gro-Seed-Starting-8-qt-Potting-Soil-Mix-74978500/204502223[/SIZE]
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https://www.homedepot.com/p/Miracle-Gro-8-qt-Perlite-74278430/204502291[/SIZE]
[SIZE=10.5pt]I recommend using a ratio of 75% seedling mix with 25% perlite for new seeds and I'd transplant existing sprouts into the same. Before you fill a cup, premoisten to where the mix just barely or doesn't quite hold together when squeezed in your hand. [/SIZE][SIZE=10.5pt]I'd keep them warmer and drier and bring them back inside to a sunny window. You don't want them getting below the upper 50's at any time for now and preferably they'd be kept at least 10F warmer than that at the coldest point of their day. Water with room temp water, even if it's collected rain water. Try to be very careful not to [/SIZE]over-water[SIZE=10.5pt]. People who aren't experienced growing peppers almost always over-water. It just flat-out seems like they need more water than they do and it can really hurt them.[/SIZE]
[SIZE=10.5pt] [/SIZE]
[SIZE=10.5pt]I hope this helps. Maybe you want to go a different direction and that's cool. I'm happy to answer questions and there's obviously lots of other who will too.[/SIZE]