I've been keeping my RTG for 6 years solely in a bare bank. It used to pair up with another RTG until that female died all of a sudden with no tell tale signs.
Bored, I slowly introduced tigers, TFBs, Bagarius and kelah. Then my uncle passed me 5x juvenile arowana (6"), and I just comm all of them together.
I guess you have to see what other fish you are intending to keep, whether it is suitable to live together with your arowana.
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