Ok, my guess is this fish is a subadult. I think youre right about the range of age you're talking about, my experience with this spicies is very short not to say none....I have kept oscars before and most of my experience is with piranha, now Im done with piranha so i decided to get into these bad boys they are deffo some stunner fish...
Fish looks in excelent conditions and he's took over the tank just as soon as he touched it's water......Im gonna see if can get him a partenr..
What do you suggest to feed him in order him to get bulky.
Cheers.