I become stingray keeper and been searching in YouTube about how to take care of stingray and found that they can be bled in fish tank also, it's so excited to see them giving birth , right now I have 1 9"male marble motoro, 1 8" male motoro and 10" female motoro,,, does anyone know how many male or female I should keep together and how big they can be bleed and what else I should concern about the bleeding stingray and size of the tank,, thank you for sharing