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The Pristella maxillaris, often called the Water Goldfinch or Tetra, is a small fish commonly kept in freshwater aquariums. Reaching an adult size of 3 to 4 cm, it can live around 4 years. Originating from South America, it thrives at shallow depths in plant-rich waters. Aquatic plants, branches, and humus-covered soil make up its daily habitat.
Adopting a diurnal lifestyle, it typically moves in schools, in rather acidic water. Therefore, for aquarium maintenance, a pH between 5.5 and 7.5 is recommended. A water temperature between 24° and 28° is also part of the recommendations, as well as keeping a group of at least 8 to 10 individuals in a volume of at least 80 L. The X-Ray Tetra exhibits peaceful behavior towards other species, but its small size can make it an easy prey if cohabiting with much larger fish.