I have three Campbell’s Dwarf hamsters. There’s Kate, a very active middle-aged female; Ollie, an active middle-aged male; and Scooter, a moderately active elderly male. All are separated.

Right now I have Ollie and Scooter in Crittertrail setups and Kate is in a large bin cage. This bin is really getting on my nerves. She doesn’t get a whole lot of fresh air, it’s boring for her, and it takes up a TON of room. I’m getting sick of it. I plan on throwing it out in a week or two and purchasing another Crittertrail. All I have to ask is,
If you had the following cages, how would you set them up for the hamsters? Keep in mind – one is elderly and not very active; two are active.

Crittertrail Three
Crittertrail Discovery
Crittertrail Primary
Crittertrail Mini 2
Crittertrail 1 (or maybe the X or Dazzle? Not sure yet.)
I also have a lazy lookout and two snap-on wheels.

I was thinking:
Active female in Crittertrail Discovery & Mini 2 with Snap-on Wheel
Active male in Crittertrail Primary & One with Lookout with Snap-on Wheel (he’s the only hamster that likes to sleep in the lazy lookout)
Elderly male in Crittertrail Three

(The elderly one still gets around just fine, has no trouble moving or climbing tubes or anything. He’s just not as all-over-the-place as the other two are.)

So, tell me your set-up ideas, I’d love to hear some input and maybe change my plans.