Apistogramma macmasteri Red Shouldered Gold Morph. These are probably our most impressive, brightly coloured apistogrammas.  The males are spectacular.  Females are gold colored with a little red on them, but the males exhibit a lot of Red and long finnage.  
 
These fish are beautiful when fully mature and make a fantastic centerpiece for your aquarium.  They are relatively mild in nature but are not timid.  Males enjoy showing off their fins.  The males grow much larger than the female.