In the second picture there , it looks like the baae of thw seedling is withering. That could be caused by a fungi called rhizoctonia, aka "damping off".
The first one I can't tell what is going on.
Whatever you use to start the seed in needs to be kept moist but not wet, if you have the seed covered, uncover them as soon as they sprout and get a light source on them.
It is easy to get carried away with equipment and make things complicated.
In the second picture there , it looks like the baae of thw seedling is withering. That could be caused by a fungi called rhizoctonia, aka "damping off".
The first one I can't tell what is going on.
Whatever you use to start the seed in needs to be kept moist but not wet, if you have the seed covered, uncover them as soon as they sprout and get a light source on them.
It is easy to get carried away with equipment and make things complicated.