wen i first added fish to my tank i bought 2 neon tetras, 2male guppies, 1 female guppy, 2 harlequins, 1 silver molly and 1 black molly. after a few weeks my guppies had babies and when i could tell which was female and which was male half of them were guppies and half were different. was this by the black and silver molly or my other fish.
















