Re: Substrate
Kaytee Clean and Cozy seems to be my hamsters' favourite. They love to tunnel in it and it holds the tunnel shape well without collapsing.
Haha yes, I've seen rocks/pebbles explode too...it is quite spectacular. I'd avoid using irregularly shaped rocks that one finds outdoors as they may well have insects living in tiny crevices that could be a problem for your hamster and without being able to boil or completely clean them this would be a problem.
If you want to use stones, I'd be more inclined to suggest getting some pond pebbles from a garden centre and scrubbing these then soaking in very hot (not boiling!) water for a while.
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