do you feed the bd's gold fish?
Those look a bit quick for Goldfish,look like golden barbs to me,either way i don't see the point in feeding live fish on this scale,sure it is sometimes necessary to get that hard to feed ray to take its first meal in captivity which means live food is a must or the ray dies ,i can only think these feeder fish are cheap and plentiful in Asia,its the disease issues that would put me off.
Awesome fish all the same.