06-11-2011, 02:04 PM
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There is more than one species, but the most frequently seen is the South American one, Osteoglossum bicirrhosum
or commonly-called Silver Arowana. It attains more than 3 feet, even larger in its habitat. A 6-foot tank will work for a juvenile, but as it grows it needs a much larger setup, preferably an indoor pond. A basic guide is that the tank for large fish should be sufficient in width that the fish would be able to turn around in its tank while full length (without bending), and the length should be several times that of the fish.