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I love aquaponics actually I build me a small system with a aquarium I got for about 30 bucks a few months back:

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Sadly my flat doesn't allow a bigger one to produce fish to eat but the system works really good. I got space for 12 leafy greens so basically I do not need to by me any lettuce at all since I started this and with the small 5W filtersystem and 36W LED light its energy costs are very low ($3 bucks tops a month)