A thought:
Unbeknownst to me, one of my fishkeeping behaviors resulted in transporting eggs from main tank into shrimp tank. Said behavior consisted of taking clumps of greenery from main tank and putting it into shrimp tank for feeding and "tidying up."
One day while studying the shrimp tank, lo and behold I spied a fry! After that I watched the main tank closely and as soon as I saw a fry I would transfer it into the shrimp tank.
I'm not sure exactly how many fry resulted from the transport of greenery containing eggs, but I do know that my shrimp tank became a very successful grow out tank.
I admit my knowledge is scant regarding the fish you are going to breed but is it possible that, once you think that eggs exist, you might transfer the nest and surrounding greenery into a grow out tank?
Here is a video of my red cherry shrimp tank where you can see some WCMM fry in the foreground and several little pair of blue eyes in the background.
(If I'm not mistaken I think earlier in the thread someone may have mentioned just moving the whole nest at a time, which is essentially what I'm suggesting).
A thought and a good thought, to be honest.
Back in the day, whilst there were many skilled aquarists who had developed their hobby enough to facilitate multiple tanks and breeding programs, many apparently just let Nature take its course.
I know that I managed to breed fish without really trying, other than maintaining effective tank ecologies.
It is possible that any of my tanks contain fry and, whenever I change water, do anything with a syphon, or remove floating plants, I'm always careful now to keep a close eye out for fry. Out of those I've found to date in my SE Asian tank, some 75% turn out to be, after a close scrutiny with my large magnifying glass, tiny shrimp. They and the fry are returned to the tank.
Whilst I do have emergency-only space available for a hospital facility, I'm trying to be cautious with breeding, so that I don't get over-run and compromise the ecologies for the other creatures there.
(If my Cockatoo Apistos create fry, I have a viable plan for these, so no worries on that front).