So only 2 weeks later after adding the group of Rio sarstun melanura, my dominant male has already paired up with one of them. I also just recently added Vita Chem to the tank and to their food which apparently helps with breeding so it seems to have worked. The Vita Chem is awesome stuff BTW. My fish seem super happy after adding it. But anyways the pair are now preparing a spawning site. Should be interesting how they do on their first attempt. The male is a melanura from the Laguna Yaxha region and the female is from the rio sarstun region. Not a big fan of crossbreeding two of these fish from different locations but what do you do. They could actually make some nice looking fish. We will see. Here's a little video of their pre spawning action.