I would let your seeds germinate until the tap root us 2-3 cm long. I seen the seeds a split and the tap root is showing but I’ve had much more success letting them develop a nice long root in the towel.
Also, seems to me your soil looks drenched, make it damp and dome them with clear plastic cups to hold in humidity.
Lastly, seems as though they are stretching a lot, it the light is dimmable increase the light, if it’s not dimmable move the light closer to the plants