PFK says
'Sexing: Quite simple to sex when the fish are in good condition. Males are brighter coloured and have bright red fins with squiggles of blue-black in the dorsal and anal, and the upper lobes of the caudal fin. The chests of males are also more orangey and they tend to be slimmer. Females are slightly less colourful, with less red and fewer dark squiggles and uncoloured pelvic fins. They have rounder bodies and a slightly paler overall colour. Both sexes have the same chunky appearance seen in Danio choprai and the hump-backed of Microrasbora erythromicron.
Breeding: Pete Liptrot and Paul Dixon of the Bolton Museum Aquarium were the world's first fishkeepers to spawn this species, and they managed to do just a couple of weeks after the fish first became available in the UK. Very little is known about reproduction. Paul says that he observed a brightly-coloured male attempting to drive females into a spawning mop and Pete found seven small eggs in a clump of Java moss a week later and spotted some fry which had already hatched. Said Pete: "The eggs have been laid over Java Moss and appear to be only very slightly adhesive, they drop out of the moss very easily. We've removed the moss to another aquarium to see what else hatches. As we were moving the moss one of the smaller males was very busy hunting around for eggs or fry."'
So while it doesn't mention water conditions (although I'd imagine cool water changes, perhaps some experimentation is in order), something simialr to a danio breeding setup (with mesh bottom and spawning mops/mosses to catch the eggs) would do the trick.
