Well its the cycle of life dude. I had a 35centmeter Oscars, lived for 10+years , they used to eat from my hand, they could ring a bell if put in the tank, they would play with a ball in the tank, the smartest fish I ever heard of. When the first one died I gave it to the neighbours cat to eat, I couldnt watch though. Point is we are all on that way so dont fell bad, just know how preciouss is your time here and the way you treat others when they are alive.

PS: Get Oscars - Astronotus Ocelati