Gerbils should live in tanks with deep substrate for digging. The minimum tank size should be 100x50cm, such as the Falco 100, IKEA Detolf or quite often you can find tanks on 2nd hand sites that are 100x50 or bigger
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IKEA Detolf, need to make a DIY lid
Paper based beddings and/or hemp/aspen are best for gerbils, Megazorb is great for holding up their tunnels but it smells a bit strange. Fitch mixed with hay is our next favourite to use, then Aubiose or Raviera.
This photo shows a fab burrow that some of our gerbils made with Megazorb bedding