All arowanas will live for well over a decade!
Just 2 things to remember:
1) tight fitting/weighted lid
2) clean water
Not many fish left in my 315 gallon. Tankmates are x3 18-19 inch Taiwan Masheers and a 12 inch + clown loach.
I still go back home to perform 50% WC once a week and I clean the sump every half a year. Not a lot of maintenance since stock is rather light now.