Hallo!
Stefanies Idea seems good to me, if the parents show to be canibals …
Perhaps an net with a frame would be also a method to divide the tank instead of an acrylic plate?
With fry boxes in the tank I’ve never had good experiences , but that was in “usual” water, but not in black water. It was so difficult to keep them clean enough ..
For example with young catfish. By the way, we have low carbonated Black Forest water, but with a basic pH to protect the water pipes …
But I suppose, (now I know more about black water than that time) it was a problem with not “clean” and not sour enough water …
It seems to me that nearly all aquaristic fish for low carbonated water are black water fish and need low pH and low bacteria number…., especially the fry … But nobody tells the people who buy them …
Perhaps most of successful aquarists have high carbonated water and use anyway osmosis water?
And have therefore better changes to give the fish the “clean” water they need, even if they don’t know much about the necessary balance of the water values?….