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IMHO, arrowanas are the coolest fish. Ever. I hope one day I can have one. A few years ago on craigslist I saw someone selling a 29gal tank w/ silver arrowana and a 10g tank to hold the feeders for $125.
Some people put bricks and stuff on it. Oh and a lot of keepers reduce the water level a little so they dont make contact at full force.. I kinda want to make an indoor pond for an aro one day.