My father and I kept a black arowana in a 6x2x2 tank a few years back, before it jumped out of the tank and died during the night... at the time, it was about 3 feet long. In retrospect, I would have put in a much larger tank, and put more bricks on the canopy.
IMHO, arowanas are great fish if you're able to provide the correct tank conditions for them (like most other fish)... the problem is, the average keeper cannot do that. Silver arowanas are the ones you need to watch out... I've read that they can grow up to 8 feet long... and I've seen one that was at least 4-5 feet long. Those ones are relatively inexpensive and easy to find, but getting the correct tank for them would be the killer.
-Richer
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