I would only keep him with other very large fish... Dovi, Red Devil, Texas or Flower horn...
Ive seen them 14-16 inches rare but they can get that big
My favorite fish ever...
Biggest one I ever had was 12 inches and was a straight killer had to keep him by him self in a 29 gallon he got to big and had to get rid of him... I felt bad for him in that small tank..