Just wondering if anyone has tried building their own Bathtub Aquaponics System?http://www.ecofilms.com.au/2010/07/09/bathtub-aquaponics/It might be more suited for people with limited space and perhaps using goldfish as their fish source? Sourcing a used bathtub at any recycle center should be a cheap solution for anyone wanting to test the theory of growing their own fish and vegetables...