[Pebbles82]

Do you have a photo? I found our robo was happy in an 80cm by 50cm (floor area) cage. I thought he may have enjoyed a bit more space even - but he seemed happy in that. Some of it also depends on set up - they like to feel protected overhead so a shelf or platform helps them feel secure - something to hide under - and ours loved to climb on his - I had his sand bath on it so it didn't sink in the substrate. They also love their wheels and ours had an upright wheel and a flying saucer and would use both.

They are very active so they do like a good sized cage, providing there are plenty of floor toys for them to dive under and a good depth of substrate. I only had about 5" deep in our cage but our robo would pile it up in a heap in the area he wanted his nest.

But their personalities do vary and some are quite shy. Which country are you in? I found it difficult with top access only with a robo as a hand coming from above scared ours and I found the access difficult generally, so moved him to the slightly bigger barred cage which had a big front door and made interacting easier with him. Some of that depends on the hamster and you can always lower a tube for them to walk into and lift them out that way (carefully!).

I wouldn't add another bin. Two joining cages don't give the effect of them having the one territory which they like to do different things in. They do much better with one space that's the right size.

As you've only had her a week, I wouldn't think about upgrading her cage just yet, she'll need at least 2 weeks to fully settle and mark her environment. Also, don't clean anything for the first two weeks. Robos are not particularly smelly and the amount they pee is tiny (I reckon it evaporates mostly!). So you could even go 3 or 4 weeks without cleaning her out. And even then it's best not to clean everything at the same time. With a robo I used to clean one half of the cage at a time so the other half always stayed and smelled familiar. Then do the other half 3 or 4 weeks later when he'd settled again. Also if you can keep back some old substrate that is clean and sprinkle/spread that on top of the new, when you do one half, then that helps them adjust to the change quicker. They don't do well with change and disturbance.

So even when just doing half the cage, it's still best to just do the substrate - do the wheel another week and any toys another week again. Leave their nest in tact if you can and dry hoard can also be left. Our robo never pee'd in his nest and it always stayed clean and dry (and rather cosy). If you keep putting out strips of torn up plain white toilet paper in a pile,they will keep refurbishing their nest themselves.

If you ever do have to remove their hoard (it can get quite large or be a bit stale at the bottom half) then always try and leave some behind and add some new food as well. Never remove all of it or they get very stressed and start to have abnormal behaviours. If you do have to remove all of it for some reason (unlikely with a robo), then always put new food back in the same place to replace it.

Anyway enough about cleaning. I would leave her in the current cage for about a month and see how she goes. If you have a photo it could help us advise on things you might want to add for enrichment/cover so it isn't too exposed. Although you may have that sorted aready. Adding the odd thing is usually accepted well, but moving things round or taking them away can stress them. She needs a good couple of weeks just to settle really, but adding something is ok if it helps give her some enrichment or to feel more secure.