One male, depending on the male could handle 1-2 females. We've had males work two females and get the job done, but the way we do it is let him complete knock up one girl before moving on to the next. We don't place one male in a cage with multiple females.

We've known breeder that have gone the 1.2 and even 1.3 in a cage and get varying results. In some cases lower counts, higher slugs and in others the results are normal counts in both females. Whether or not any of this is related to multiple females in unknown.

Depending on how much you have vested in the success of the pair or selective breeding, I would keep it a 1.1 until the female has gone through POS and you're certain she is gravid.