I don't know for sure about Mollies...but,the black colour can be a lethal gene if bred to another black. I've had trouble with Guppies and this problem,and this also seems so with Bettas!:shock: Does someone here know about this lethal gene in blacks? When I've bred Mollies,I've usually used 1 black,and then a black marble for the male...no probs with that! But,black with black?...just don't know with Mollies!Good Luck tho!Will a Black Sailfin Molly breed with a regular black molly?