Just give them a 2' tank to their self with loads of plants and if you have fertile fish they will breed regularly and rearing them with the fry is possible and have seen it done many times.
Don't water parameters are a problem as long as they get regular water changes and have a good sponge filter you not have any problems.
Forgot feeding, the fry will find nateral food on the plants at first and feeding them all baby brine shrimp will encourage the adualts to feed, but will also feed the fry from when their a 5-7 days old.
the fry are loverly and this is where they get the name "The Cheep Man's Neon" from when neon's was quite expensive
Simply all fish will, but their not bad and with these fish it's so simple then it's eaisyer to leave them in and surival of the fittest will remove any poor fry.
So do you not recommend the marble as substrate thing you hear mentioned often, i've never bred them but i think i won't have a choice once my 15 reach maturity....