I haven't bred them but I did have a group of Botia lohachata (yoyo or Pakistani loach) in a 4x2x2ft tank. I started off with about 20 and 6 months later when I caught them all out I had over 40 of them. I didn't know they had bred I simply fed and water changed them as per normal and they did the rest.
Although lots of books say fish can't be bred in captivity, if you keep enough of them for long enough, then eventually something will happen. Originally angelfish and neons were thought to be impossible to breed and now they are bred by the millions. Saltwater fishes were also thought to be impossible to breed and now damsels, wrasses and pygmy angels are being bred in captivity.
Try keeping a group of 8-10 of them so you have a good chance of getting male and females and just look after them. If the fish are happy and healthy they will try to breed.