Mine are almost 5" and look very similar to your trimac. I even asked lfs, is he sure if it's a flowerhorn as they haven't got any vibrant colours (except for a bit of greenish colour) even after 4 inches. Seller said yes but sounded he was not sure of. And then I directly asked him are they trimacs. But they didn't know about a cichlid called trimac. They said that fish get a greenish colour in the body which is kinda vibrant and a red colour near the head. But I kinda feel that fish seller doesn't know about the fish they sell to tell certainly that's a flowrhorn. I will post a close snap when I clean the tank next time. Sometimes it might be a warrior flowerhorn.