on that same vein... a forage 'tank' is better than a pond as you avoid the mucky/sandy issues. Consider a liner if you have to go in-ground, or lined tank, or if you can swing it, a poly water tank. A poly tank with walls roughed up allow for the periphyton to adhere and is easier to keep clean and silt free. Most poly water tanks are round and tall. You could improvise by taking a large tank and embedding on its side horizontally. It is easier to capture fish from a poly tank. A round tank mounted vertically can easily be harvested with a rope system attached to a round disk with holes in it that sits on the bottom. Just lift and harvest and let it settle down again.
As Azteca proved in the recent posts, a very small body of water can produce plenty of forage.
