Uaru amphiacanthoides, known as the 'Triangle Cichlid', is native to the slow-moving waters of the Amazon Basin. Recognizable by its unique triangular body shape and dark banding, this species thrives in warm, acidic waters. It is known for its social nature and complex parental care behaviors.

Uaru amphiacanthoides, commonly known as the Uaru Cichlid, is native to the Amazon River Basin in South America. Specifically, it is found in the countries of Brazil, Colombia, and Peru within the expansive Amazonian waterways.

The Uaru Cichlid inhabits freshwater environments characterized by warm, tropical climates. The water temperature typically ranges from 24°C to 30°C (75°F to 86°F), with pH levels from 5.0 to 7.0, indicating slightly acidic to neutral water conditions. The rivers and tributaries are abundant in submerged vegetation and have a soft, sandy substrate.

Uaru amphiacanthoides occupy the mid to upper water column in slow-moving waters of the Amazon. They are known for their herbivorous diet, feeding primarily on plant material and detritus. They play a significant role in the ecosystem by helping to control algal growth and contributing to the nutrient cycle through their feeding habits.