that flowerhorn is 15 years old?
not a flowerhorn he is a Midas Cichlid/"Red Devil". and have a reputation that they are hyperterritorial fish
http://www.aquahobby.com/gallery/e_midas.php
he was about a year and a hafe old when i got him and has been the best pet i ever had for 15 years so his age is around 17 years
he is really smart for a fish gets all happy when i come home i can even pet him no one eles can
"they are very responsive to people, almost like a little aquatic dog. They will display for food, follow you around the room, constantly peer at you with their little innocent looking eyes. In fact, their cheerful coloration and enthusiastic, puppy like behavior is often in shocking contrast to the crafty determination they seem to display in murdering their tank mates."
knows who i am and not to bite the hand that feeds
and can be super mean some times if i go up to the glass and piss him off he will hit the tank so hard with his jaws that you would think he was going to bust the glass
and this is no bs i have heard of cichilds liveing for 20+years