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I just asked, because the situation my aquarium is in, I don't do anything close to regular water changes. And there is a pretty good load of fish in there for how small it is. 2 large clown loaches, 6"+, a very large plecostomus. a yoyo loach and an angelicus botia, both around 4" or so. The tank is very well established and hasn't has a trace of ammonia or nitrite in over 5 years. Even if I go for 2 months with out doing a water change, the nitrate almost never goes over 40ppm, sometimes it is still even lower. There is a decent amount of algae, the plecostomus takes pretty good care of the glass, but in the corners, on the rocks, etc... I had always just wondered.
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