Re: height or cage
Pot or ceramic items are fine. Only thing is they are quite heavy if tunnelled under - ie they could squash the hamster. For that reason I put heavier ceramic items either on a shelf/platform, or directly on the base of the cage (ie sunk into the substrate). Another option is to have them supported underneath - ie a small house directly on the bottom of the cage under the substrate with the ceramic item sat on top of it.
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