PlanetCatfish.com

Are these fish male and female ?

Trying to breed them, a month with lots of frozen foods and spirulina, ph: 7, then i plan a daily waterchange with cold water ph 6.2, a lot of floating plants... we'll see...
The breeding tank measures 120cm, and i read a scientific article that they like to breed in shallow water...
Someone who has more trics ?

I may be wrong, but it looks as though the outflow from your filter is at the water surface. Callichthys are bubblenest builders and so too much water surface agitation will prevent them from spawning.

The outflow is now more under water surface.
I'm beginning to doubt if i have a couple.
The female seems to have the same characteristics of the male but less explicit.

Lying together, man and female ... ?
The temperature is 28°C, two more weeks with this temperature and without water exchange...

From the looks of this latest picture I'd say you have two males for sure.