Reply To: Mysterious fry appear in tank with no adults! Welcome to the website! › Forums › Other Freshwater Fishes › Species Breeding › Mysterious fry appear in tank with no adults! › Reply To: Mysterious fry appear in tank with no adults! October 13, 2007 at 4:58 am #12587 L777Participant mummymonkey, thanks for the experience. How long does it take for the fry to darken? Mine are nearly transparent still (less than a week old).