Sorry to hear about the hurt one. Hope the vet can sort something out. It is now really important you tame your hammies as then you will be able to give them their fun time out and also a health check every day or two days at least. Start as if they were new and be very aware of the porrly one who will need extra care and may need meds given so will need handling. Look here and start now with the scented tissues
http://www.hamstercentral.com/user.php? ... ticle&a=44
It is harder to tame robos so be patient and calm. Even the most experienced breeders have fight issues with dwarfs and the more posts I see about fighting the more I feel these animals should not be sold as sociable pets as it all to often goes very wrong.
Keep us posted how he gets on at the vet and get the vet to sex the hammy for you too.