[LunaTheHamster1]

I have two syrians, both female. Star couldn't care less about Luna, but Luna on occasion goes into full on sniffing mode. I too worry about it stressing her out, but I kind of reckon loads of people have far more than 2 hamsters and obviously breeders and rescues will have a load of hamsters all in the same room.
I have their cages opposite ends of the room. Also when it comes to free roaming, I have one in a run and one in the conservatory, no way can they get to each other and I am there supervising. To be honest though, majority of the time Star wakes up earlier than Luna, so she's out first then Luna for a little bit later on.
I can't use the conservatory in the winter so I am looking into being able to section 2 parts of my bedroom off for them, so they can both mark their own territory without stressing Luna out. Like I said Star doesn't care.