I have no experience on keeping pac mans in those kinds of tanks, but I think it would be possible as long as you keep all the plantas in their vases. Otherwise the pac man will destroy them in his excavations.
Also keep in mind that if we like to feed him or put him defecating outside, it will be a problem to have a very complex tank.
But yes, I think it's possible and I've seen examples of these kind of tanks before
edit: oh and another thing, they kind of move a lot of earth when moving, and a natural pond will probably get all dirty in no time... and you can't just remove it and clean it like you do with a plastic lake...






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