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nothing below a 125, my buddy has 2 of these guys in a 180 with some kinda bass looking fish and they look like they could use more room, there not the kinda fish for begineers
Type it into wikipedia... I guess 60 inches is a bit of a stretch, but 50 inches (wikipedia states "over 48 inches": 48 inches is 2 away from 50, last time I checked) is right on the mark. I will try to find another link, but I personally saw one once that was over four foot, crammed into a 280 gallon tank at a pet shop in Fort Lauderdale. I wish I took pics. He looked like he could grow some more and was already as fat as a potbellied pig.
The point I was tring to make is that people are seriously mislead as to how big most of the fish they keep are going to grow, let alone a mature arowana... They are truly monster fish.
Without a pond like structure, I think the arowana should not be purchased. They just grow too big for all but Public Aquarium Exhibits. This is kind of why I have a membership to the Baltimore Aquarium. Anytime I want to see these beasts, I go and spend an hour taking them in...