I would definitely not put one with a JD, let alone two. Aro's are not aggressive fish. They will eat a lot, their mouths open REALLY wide and they'll eat any smaller fish in the tank...but that doesn't mean they're aggressive. Whether the JD's are 8 inches and the Aro is 10 inches, or who grows faster, really doesn't matter because I think the JDs would terrorize it. You dont want to spend money (a LOT of money in some cases) on a fish that your current fish will just eat.