Depends, all my fh's have had nice sized kok's at 2 inches. Usually those are the stunners as they developed early and end with a higher genetic potential but maybe yours is a late bloomer? Just take care of him with a good stable food (nls, hakari), clean water, and also a tank size relative to the fishes size and he'll reach his maximum potential.
Heres some of my babies,
Around 2.5 inches suffering from hex

Around 2.5 inches.

My baby named apple when he was about 2 inches

Heres a video of him at around 6 inches I think?
https://www.youtube.com/watch?v=I9s9YEhJH-o
Heres some of my babies,
Around 2.5 inches suffering from hex

Around 2.5 inches.

My baby named apple when he was about 2 inches

Heres a video of him at around 6 inches I think?
https://www.youtube.com/watch?v=I9s9YEhJH-o





