The Apistogramma viejita red-neck Macmasteri male is a beautiful and unique fish, native only to the Amazon basin. It has a very distinct red-necked pattern, with a bright yellow body and a black stripe running along the back. The fins are yellow, with a red-orange edging and a few black spots, while the tail is yellow with a black outline. This fish is quite active and loves to explore its environment, often swimming along the tank walls and bottom. They prefer to be kept in groups of their own species, with plenty of hiding places and a sandy substrate. Males are territorial and may fight with each other, so they should be provided with plenty of space and plenty of hiding places. They are omnivores that feed on both live and frozen foods, and they are quite hardy and easy to care for, making them a great choice for beginner aquarists.