[Pavel Chaloupka]

Ok, than going for larvae separation right after they get pigmented is clearly best. I already isolated what seems to be nicely multiplying Rotifera culture from one of the tanks, so hopefully I will have that culture next time. Rising the fry should be much easier for first couple days with this. It is evident that they are smaller than usual Brachionus but I was lazy to pull out a microscope so far and try to identify them.
Anyway thanks for help Bernd, now I probably know all the transferable information I needed and the time for experience is coming 🙂