[CMB]

I keep the wheel hides and water in the same place but will also change other things, like tubes etc..

I take something out and put something different in. I do one change at a time and see how the particular hamster responds. Let your hamsters response guide you on wether it likes things changed or not and the frequency of any change.

My new hamster is still settling in (had him for 10 days) so no changes for him yet.