Thanks Rafael 🙂
See https://www.parosphromenus-project.org/de/forum/40-Behaviour/1809-no-cave-no-nest-parvulus-spawn
I have 10 young specimens growing already, not sure if the parents continue their reproduction, I gave them a sligthly bigger tank with some plants and leaves, so not that much control anymore. In case I do not spot any fry within reasonable period, I will switch back to the controled aproach and remove the fry before freeswimming.