I never actually try to set up a self-sustained miniature ecosystem in a cage before, but from what I've heard that is a little hard to keep clean. In nature the waste get spread out and then broken down pretty quickly by microbes and small invertebrates and such, but in captivity it's more concentrated. You would still need to spot clean it everyday anyway and do a complete cleaning once in a while...hardly worth the effort, if you asked me.

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