We had some yellow calvus and liked them a lot but when downsize time came and the choice came between the yellow calvus and goldface comps, we chose to keep the comps.
You'd be surprised to. You might see fry in that brichardi tank, maybe never really grow them out though. 3.5" is when our comps and calvus started showing breeding behavior though so keep an eye out and get a calvus cave if you want to save those fry. Makes collecting them a lot easier!