Pygmy Hatchetfish
Gasteropelecidae sp.
Pygmy Hatchetfish (Gasteropelecidae sp.) — Varies care, Peaceful, under Other. Minimum tank in the app: 26 US gal min; aim for 73–79°F and pH 6.5–7.5. The Pygmy Hatchetfish is an intriguing choice for aquarists seeking a small, mid-water species with unique swimming patterns.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
South America
- South America
Regional colours match the stocking calculator’s origin map.
Pygmy Hatchetfish Tank Setup
An ideal setup for Pygmy Hatchetfish includes ample floating plants to create shaded areas and reduce light intensity, mimicking their natural habitat. A well-structured tank with hiding spots and smooth substrates encourages natural behaviors, while moderate water flow is preferable. Lighting should be subdued to promote a sense of security.
What Do Pygmy Hatchetfishs Eat?
Pygmy Hatchetfish are omnivorous and can be somewhat timid feeders, so it’s crucial to offer them small, high-quality foods that sink slowly or float. Competition for food can arise if housed with faster or more aggressive eaters, potentially leading to nutritional deficiencies.
Pygmy Hatchetfish Tank Mates
Best tank mates include other small, non-aggressive fish that occupy different swimming zones, such as tetras or rasboras. Larger or more boisterous species may intimidate them, leading to stress. While they do not exhibit strong territoriality, keeping them with numerous other Pygmy Hatchetfish can enhance their confidence and establish a more cohesive group dynamic.
Are Pygmy Hatchetfishs Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate the need for cover and floating plants, leading to stressed fish that hide excessively. Overcrowding the tank or including aggressive species can result in bullying, causing health issues.
Building a community? Run the full list through the stocking calculator before you add anything else.
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