No Motoro, they grow too big for only a 2 foot wide aquarium, the Arowana will most likely become aggressive to the other fish.I would do
2x cichla Kelberi
1x cichlid azul
Spotted Saratoga
Marble motoro stingray
Ghost knife
2x oscars
avoid buttokoferi as they are african
Jaguar cichlids are risky and can be extremely aggressive
Flowerhorn would try to kill