I suspect overwatering...of course, more light isn't gonna hurt...but seedling NEED to dry out somewhat between waterings...makes the roots seek...
I'm positive your soil is too hot. you'd really have to try to overwater a seedling. they shouldn't really need much light but more can't hurt, they will just stretch out if they don't get light-not turn yellow.
not temperature hot, nutes hot
My soil just gets kind of warm sometimes,never hot and i watered i about 2 days ago