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How big is big?
The minimum common opinion for a single Oscar is in the range of sixty to seventy gallons. A tank with a depth of 18? is a good idea, since most adults will grow longer then the depth of a typical 12? tank, which limits the Oscar to a very two-dimensional world. Instead of going with the 55g four foot tank, perhaps it?s worth looking at the 60g three foot tank, which has the depth we?re looking for. Better still, why not just do it right the first time and go for the 48?x18? tank and get the best of both. Height is not really important (within reason), but remember that water volume is always a good thing.
For a pair of Oscars the 48?x18? works well, and with enough space to keep it a 24? depth would have the added bonus of space and volume, and make for an impressive display. For a group of Oscars we are now looking at over 240 gallons or ponds.