I have a Malawian pike male that is 7 inch, still not showing color. Another Malawian eye biter only started showing color at about 7 inch. You should expect larger hap males to take longer and larger size to show color, and smaller hap males to start showing color sooner and smaller. It also depends on the pecking order of the fish. A dominant peacock male in my grow out tank started showing color at only 2 inch. Fusco is a large hap, so it will take longer and larger size to show color. I have seen a dominant Fusco male in a species tank in LFS showing color at 3 inch. In home aquarium in submissive state, don't expect Fusco male to show color at less than 5 inch.