I dont think so I have a odoe in my 100g its around 7in and a silver aro around 8 and they dont fight at all, but my aro will go after my spotted P bass lol
Gotta 12in Odoe and a 24+in aro together. They flex toward each other every now and then but get along fine for the most part. I think it depends on the personality of both fish. I say try it but just be prepared (if at all possible) if the combo does not work out.
when i had my 13" odoe with my 18-20" silver, they got along fine. when i added a 9" Jardini, he went straight for it and injured the jar's eyes. i think it depends on your fish's personality mostly.
I had an 8 inch odoe and about a 10 inch arowana, and there was some fighting. The Aro would stare him down, and attack. But nothing too bad, they were good 99% of the time.