What would be a good top level fish? The extremes of my tank are 11.5" IT datnoid and 2.5" clown loaches.
Arowanas? depending on size of tank ofc...
As a catfish fanatics, I would recommend Dourada Catfish. They are sensitive fish & hard to keep it intact and harder to kept alive. In captive, they maxed out at 2.5' ish