Under an inch a year for me. Sometimes when kept with other cichlids they seem to shrink but its just relative they grow just slow I think.
I do not feed particularly heavily or do more than 30-50% weekly waterchanges and keep em at normal temps about 75 F.
I think others may get faster growth.
Interested to see what folk say.
WC can be slow to accept dead food sometimes. I found popping these in with TB that eat voratiously soon fixed that. They were soon compeating for every flake or pellet I put in just like most other fish.
I think if you keep just a WC pair, its then that they can sometimes bully the owner into feeding what they chouse (live stuff like small shrimps) rather than what the owner would preffer and find easier.
they grow real slow. i have some that are around 2 inches, and probabally a yr old. as for shy eaters, i noticed with black calvus that they are very secretive with eating, but my yellow comps i have now eat faster than my mbuna tank does, which is kind of crazy. *** never had fresh w/c fish though so i cant talk about them. wild fish do grow slower though, and tend to stay smaller. mine readily eat flake food, and i supplement with various live and frozen foods. theyre by far my favorite fish i own.