[Peter Finke]

Yes, P. nagyi is no quite as easy as filamentosus or linkei, but not more difficult than the bintan-variants.
But mind: The real experts don’t rely on the “natural method” and look for young that survive in their parent’s home. Instead they take a small special tank for spawning and caring the eggs and larvae by the father-fish, and then remove the larvae when they are short from leaving the cave. Mostly, you can produce many young only this way. It is rare that you have pairs that don’t touch their young at all. I once had a linkei pair and a filamentosus-pair that were very caring for them. In both cases I finally could “harvest” more than fifty resp. sixty young from a well-planted 12-liter-tank in which thay had grown aside their parents.