X-Ray Tetra (Pristella)

The X-Ray Tetra (Pristella), scientifically known as Pristella maxillaris, belongs to the Characins family group. Adults reach a maximum size of approximately 5 cm and have a compressed body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a low level of biological waste.

To thrive, the X-Ray Tetra (Pristella) requires a brackish tolerant aquarium with a minimum volume of 60 litres and a tank length of at least 60 cm. Water temperature should be maintained between 23°C and 28°C, with a pH range of 6–8 and a general hardness of 2–20 dGH. A moderate water flow is preferred.

The X-Ray Tetra (Pristella) is a rewarding species to keep, provided its core environmental needs are met. This species is available in 3 varieties: Standard, Golden / Albino, and Balloon. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.

When setting up an aquarium for the X-Ray Tetra (Pristella), a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include dense planting to provide cover, break sightlines, and reduce stress.

Classified as peaceful, the X-Ray Tetra (Pristella) is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.

X-Ray Tetra (Pristella) is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide a keeper who can commit to a proper group of at least 6. It makes the most sense for a hobbyist who will actually build around its needs, especially plants.

The most common mistake is buying X-Ray Tetra (Pristella) for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is underestimating its social needs. A token pair or trio often behaves very differently from a real group.