06-04-2011, 01:15 PM
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In a Walstad tank, and the substrate colonised by blackworms, seeded by cyclops, and lightly stocked (a handful of mosquito fish in a 75G for example) with lots of plants, you could theoretically get maintenance down to once every 6 months, and feeding whenever you feel like it. Of course, you'll have to break down the tank and start over once a year, since the substrate will get depleted quickly.
Hopefully Byron will stop in, since he lives in canada as well and is our resident plant and fish guru..
Not sure why cold climates would matter, since we tend to buy things called "heaters" that keep the water close to 78 degrees F or so...