Pristella Tetra (X-Ray Tetra) Care Guide: A Hardy Beginner Schooling Fish
The Pristella Tetra (Pristella maxillaris), better known as the X-ray tetra, is a hardy, peaceful schooling fish named for its translucent, almost see-through body. Its transparent body, yellow, black, and white fin markings, and easygoing nature make it one of the best beginner tetras available. This guide covers everything you need to keep a healthy school.
Pristella tetra care: quick overview
- Scientific name: Pristella maxillaris
- Adult size: about 1.75 inches (4.5 cm)
- Minimum tank size: 15–20 gallons
- Temperature: 72–82°F
- pH: 6.0–8.0
- Temperament: peaceful, schooling
- Diet: omnivore
- Lifespan: 3–5 years
Why it is great for beginners
Unlike many tetras that demand soft, acidic water, the pristella tetra is remarkably adaptable and tolerates a wide range of pH and hardness, including harder tap water. It is also one of the few tetras that can handle slightly brackish conditions. This forgiving nature makes it an ideal choice for newer aquarists who are still dialing in their water parameters. Even adaptable species benefit from stable, fully cycled freshwater conditions, with zero detectable ammonia and nitrite. Avoid sudden changes in pH or hardness when acclimating newly purchased fish.
Tank setup and water conditions
Provide open swimming space in the middle of the tank alongside planted areas for cover. A darker substrate and background make their subtle colors and translucent bodies stand out. Live plants also help maintain water quality—browse live aquarium plants for their home. Even hardy fish do best with clean water, so keep up a regular routine using our water change guide.
Diet and feeding
Pristella tetras are unfussy omnivores. Feed a quality flake or micro-pellet as a staple and offer occasional frozen or live foods such as daphnia, bloodworms, and brine shrimp to keep them in top condition. A varied diet helps meet their nutritional needs: rotate high-quality prepared foods with occasional appropriate frozen or live foods. Offer only what the school eats promptly, and remove uneaten food to protect water quality. Small amounts once or twice a day are plenty.
Behavior and schooling
Keep them in groups of at least 6–8, though larger schools look better and reduce shyness. In a proper group they are active, confident, and constantly on the move in the middle of the tank. A longer aquarium with unobstructed swimming room is preferable to a cramped, tall layout. Observe the group daily for unusually withdrawn fish, clamped fins, or changes in appetite.
Tank mates
Their peaceful temperament makes them excellent residents of community tanks when fish have compatible temperature, water requirements, and space. Introduce them to a mature aquarium rather than using them to cycle a new tank. Their peaceful temperament makes them excellent community fish. Good companions include other tetras and rasboras, corydoras, peaceful barbs, dwarf gouramis, and livebearers. Avoid large or aggressive fish. For more schooling-fish guidance, see our tetra care basics and complete guide to freshwater tetras.
Is the pristella tetra right for you?
If you want a hardy, adaptable, and genuinely easy schooling fish that adds gentle movement and an unusual translucent look to a community tank, the pristella tetra is an outstanding pick for beginners and experienced keepers alike. Find them among our freshwater fish.