i have 4 white and black mollies and only one that has produced fry. the other 3 females dont get pregant and im wondering why. could the other breeds of fish be pestering them that they stress them out and dont get pregnant. its a 55gal tank with tiger barbs, platies, some small shark looking fish. i dont ever see the barbs or sharks bother them, tank temp is 78. 4 female mollies to 6 male. im thinking of putting the mollies in a separate breeding tank. thanks