It's 72 long and 24 wide. Don't know the height. I heard that Jardinis get smaller than Silvers could one of those work? And can I see a picture of your Arowana?
Sent from my iPad using MonsterAquariaNetwork app
Check the height. Your tank is probably a 180g which is 24" tall. 24" wide will get you by for the first year for a silver. Maybe a year and a half but definitely not 2 years. That's if you buy it at ~6" and don't powerfeed it. Jardini wont work either full time either. Jars get 3 feet which means they can't turn around in a 24" tank. They also will not tolerate tankmates. I would not recommend trying. Some will tell you otherwise but in 90% of cases it results in death.
Its a Jersey Thing