Breeding My Bristle Nose Catfish

[Bogbrush250]

I've had 2 bristle nose' in a tank together for over 6 months and was just wondering how I can get them breeding

 

[betta fish]

Hi, how big are they? and are they definitely male and female? post up a pic of the pair so we can have a look 

within 6 months I would have expected a mature pair of bns to have bred, do you have caves in the tank? what size is it? and any other fish? just need a bit more info to be able to help.