X-ray tetras (Pristella maxillaris) are from South America and the Amazon River. They are small translucent fish that reach a size of about 1.5-2 inches (about 4.5 cm) in length. They are often referred to as water goldfinches due to their coloration. Like the other tetras (e.g., cardinal, neon) they belong to the family Characidae.
They are peaceful fish that do well in community tanks with other peaceful fish that aren't large enough to eat them. You should keep at least 6 x-ray tetras together because they are shoaling fish.
Like all fish from the Amazon, they prefer soft, slightly acidic water and a water temperature between 72-82 degrees Fahrenheit or 22-28 degrees Celsius.
They will eat flakes, frozen, freeze-dried, and live foods.
They are egglaying fish and will breed in the aquarium, providing you have a compatible pair. During spawning they scatter their eggs, which hatch about 24 hours later. When the fry become free-swimming they should be fed liquid fry food for egg laying fish and newly hatched brine shrimp when they are able to eat them.