It uses about $6 of electricity per month and I give the fishies about $10 of what we call 'treats' (special fish food) per month. For that, I get tilapia, shrimp and all the normal (but shorter) produce items. It's also much easier to harvest and we usually have excess to give away. Water use use is about 40 gallons per month and space is 8 ft x 8 ft.
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