I would do about 8 total 2 males and 6 females but just make sure the water is right and that you have enough filtration for the load at least 12 times the tank size to be safe and have a steady flow of water motion going through the tank would not hurt also.
So about 1600 to 1800 GPH should do fine
So about 1600 to 1800 GPH should do fine
