Re: Tubes?
If the tube is the right size the hamster pushes itself against the sides of the tubes with its body and feet to get up and down.
You may be able to make the insides of the tubes rough to give more grip for your hamster to help it climb up and down.
Some wire inside the edge of the tube may work.
If the tanks are the same height and width you could remove one end off each tank and use aquarium sealer to join the tanks together.
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