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Freshwater fishRocket Pencilfish
Rocket Pencilfish
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The unifasciatus pencilfish is also known as the hockeystick and the zipper pencil fish. Oh - it is also called the rocket pencilfish since half the time his head is pointing up like he is ready to take off. Of course, the other half of the time his head is pointed down like he is going for a crash landing. In a school, these fish hover at alternating 45 degrees, creating the famous zipper pattern. We recommend the purchase of at least six to see this visual effect!
Quick Facts
| Scientific Name | Nannostomus unifasciatus |
| Origin | Colombia and the Amazon basin |
| Care Level | Moderate |
| Temperament | Peaceful |
| Adult Size | Up to 2" |
| Lifespan | 5–6 years |
| Diet | Omnivore (tiny foods) |
| Water Temperature | 75–82°F |
| pH | 6.0–7.0 |
| Group Size | Does best in a group |
| Shipping Size | Approx. 1½" |
Care Guide
Tank setup: Give them a planted tank with floating plants, gentle filtration and a lid, since they can jump. Soft, slightly acidic water brings out their best color.
Feeding: Feed crushed flake or micro pellets once or twice a day, only as much as they eat in a couple of minutes. They also enjoy frozen brine shrimp.
Tankmates: Pencilfish are shy and peaceful, so keep them with other small, gentle fish such as small tetras, rasboras, pygmy corydoras and shrimp.
Good to know: Rocket pencilfish swim at an angle, and a group tilted in different directions creates their famous "zipper" look.
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