Hi Patrick,
I had a bit similar thoughts and questions some time ago.
First time I had a breeding success I decided after my questions here in the forum
to just let it go it´s way. But after some time all the fry were gone, I suppose eaten by the
parents. After some weeks they made a new nest, so I thought if they eat them anyway I can also give it a try.
I knew that it takes around 9 days for the larvae to leave the cave. On the 8th day I sucked them out of the cave with a little airpipe into a little plasticbox(24cmx19cmx13cm) from a known swedish company. I put a lot of javamoss inside but think today it was not clever.
The first days I lost quite some larvae. I feeded small artemia twice a day and cleaned the ground before feeding again. I filled in new water from the parents tank after I cleaned and raised slowly the waterlevel over the days. Now they are 3-4 weeks old and I hope (knock on wood) that I won´t loose more. Out of around 30 I have 20 left.
Yesterday I seperated again around 30 larvae with the same method.
It´s still a long way to go but I could learn already a bit.
Now I use only drifting plants in the boxes out of tanks or from the balcony where I have a live food bucket. In the roots they can find some infusoria and a place to hide. The dead artemia are lying on the ground and can be sucked out easily with a pipe. Before the dead artemia were hanging in the javamoss and I couldn´t get them all out which I guess had a bad impact on the waterquality.
I would recommend to just give it a try, learn from possible mistakes and try to develop your own method.
greetings
Volker