They hatch very quickly, as the baby developes in the egg the egg darkens, but are held in the bubble nest by Dad blowing more bubbles.
If any drop out, he, hopefully, will pick them up and spit them into the nest.
If possible, drop the level to about 100mm, make sure the heater stays under water.
Keep the lid on to conserve the humidity.
Have lot of floating plants and java moss for microscopic food and shelter for the babies, don't forget to have snails too.
The fry will take hard boiled egg yolk squeezed thru a hankie, but don't over feed this.
No light is required.
Alan 104