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Evil Genius
Join Date: May 2006
Location: On top of my BBQ
Posts: 5,649
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A fun way to have a closed eco system is to take a gallon pickle jar, a zebra danio, and a couple of live plate. Screw the lid on tight, the fish poop feeds the plants, the fish eat the plants the cycle continues. 6 months + is possible.
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Life is a big ocean to swim in.
Wag more, bark less. 
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