Bro, Tank is too small, it will JUMP out..better have a cover for arowana tanks to prevent this. My cousin's Pearl Arowana become salted fish as it jumped out...LOL
I would recommend a basic air pump with air stone or filter sponge to add aeration. Fish appreciates extra oxygen in the water as OHF might not be able to provide sufficient aeration. You are not into planting right? if not Arowana in planted tank will look gorgeous...lol..
Does your tank comes with lights? hard to appreciate fish without lights..
Since you are sure that you are going to upgrade soon, why not go for 4 feet directly? NO need heaters...
Btw, i am in north area too...

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