[Clerk]

Giant danios get fairly large, and need a group of 6+, and a tank size of at least 4 ft due to their size and active behavior.

If the tank is smaller then that... return them.. If you are trying to breed them, pick one species. Zebras or Leopards, both are nearly the same, and breed about the same. They will eat fry of other fish, if they can eat them in a bite or 2. They will also eat the eggs if not watched properly.