First off, let me assure you, I have no intention to buy an arowana for several years, if ever. I thought they looked cool, but weren't for me until I saw some in real life at the Denver Aquarium on vacation recently. But from a quick search, I haven't found much good info online. Even tanks sizes seemed varied, I think 150 to 200-something for just the one. I assume the different species are very varied, and I'd probably find better info if I was more specific. So is there any good 'beginner' website to start narrowing my search?

I suppose this is more long-term idea gianing than any actual planning at the moment. Who knows if I instead decide to have several 75's or somethign with communities instead? i just wanted to get some information, thanks for any guidance you can give me!