I currently own Myleus Schomburgki, Mylossma sp. Myleus rubripinnis, Collossoma bidens? and some unidentified Metynnis sp. I have yet to spawn any of these fish. I know in nature that spawning coincides with the rainy season. Since the fish already are trying to spawn you are way ahead of the game. I would try to isolate the fish in a tank with a spawing mop or a lot of plant material such as hornwort or similiar. However, since these fish love plants it could be a problem if the adults are left in the tank too long. If the eggs hatch give them infusoria and then baby brine. This is only one approach perhaps someone can give a better response. Good Luck