03-20-2010, 06:27 PM
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Some local people in my fish club do this in the summer. They use 50 to 300gal bins and cattle troughs for fish. Some do no filter, no heater, no water changes all summer. Usually the tub is seeded from a pond in early spring, and dirt/much is added to the bottom. Live plants can be added too. It is allowed to go green, basically one big green water culture. Then daphnia is added to the bin, once they have reached a decent population. Fish are added, usually this is for egg laying fish. Young and adults can often live and breed in this tub for some time feeding off of all the microorganisms. Livebears, probably don't need so much prep, especially if you plan to feed them. A number of people recommend a fountain to provide some circulation and aeration of water.
With no water changes, most install overflows, which are just holes cut in side of bin where you want the water level to be. Then screen is fitted over the holes, this stops bin from overflowing when it rains. It can rain quite a bit in MN/WI, if you live in a more arid climate this may not work.
If we can do it while being neighbors to Canada you shouldn't have a problem