2/ very cool I've got some interest in building a "natural" swimming pond on my farm, and the way these things work is similar: two ecosystems, one for swimming in (deep, not much vegetation) and another for filtering (shallow, lots of sand & plants)https://twitter.com/ElamBend/status/1437398401147146243 …
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Oddly fascinating.
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One time this guy I knew showed me this enormous fish tank he had. It had an amazing little ecosystem all of its own. Then he opened up the cabinet that it sat on. There was another tank below that had a completely different ecosystem & was working as the filter for the big tank
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