Besides mosquitoes, maybe too much "hot" soil for a seedling?
Seems "burned" like my seedling....
growdiaries.com/diaries/210117-fast-buds-purple-lemonade-auto-grow-journal-by-nonick123/week/1186362
growdiaries.com/diaries/210110-fast-buds-gorilla-cookies-auto-grow-journal-by-nonick123/week/1186368
like