Marbled Hatchetfish tank mates
Marbled hatchetfish tank mates are a surface-and-lid problem. These fish own the top centimetre, jump, and need calm company below. The live engine marks cardinal tetras and rummy-nose tetras as usually safer neighbours. Common plecos, corydoras, and tiger barbs sit in caution. Oscars are avoid. Buy a real hatchet group, seal the lid, and skip boisterous midwater that slams the surface film all day. Otocinclus sit in the conditional column purely on trade-identity caution — care-wise they remain gentle grazers; open the pair page for the caveat.
Our first pick
Rummy Nose Tetra. Calm midwater schoolers that usually leave the surface film to hatchets without inventing a chase war. Run the pair check →
Common mistakeLeaving any gap at the surface edge is how keepers empty a hatchet school overnight. They jump several body lengths through a 2 cm gap, especially after a sudden light change. A tight lid is not optional décor — it is the husbandry.
Each name below opens a pair check with Marbled Hatchetfish. That check is the decision, not the list itself.
Usually safer companions
Conservative shortlist from this profile. Open a pair page before you buy.
The Marbled Hatchetfish profile lists Cardinal Tetra as both safe and a recommended pairing. Cardinal Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish. Cardinal Tetra swims in the middle zone while Marbled Hatchetfish stays in the top, so the two will not crowd the same water column.
The Marbled Hatchetfish profile lists Rummy Nose Tetra as both safe and a recommended pairing. Rummy Nose Tetra schools in groups of 8 or more, so plan room for the whole group rather than one fish. Rummy Nose Tetra swims in the middle zone while Marbled Hatchetfish stays in the top, so the two will not crowd the same water column.
Risky or situational
May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Tiger Barb is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Marbled Hatchetfish. Run the pair checker before stocking.
Fish to avoid with Marbled Hatchetfish
Predation, aggression, or space rules on this profile. Treat these as poor default mixes.
Oscar reaches 35cm and is flagged predatory. Marbled Hatchetfish at 3.5cm is prey-sized for it. Oscar needs at least 300L, far above the 60L minimum for Marbled Hatchetfish. The tank that houses one stresses the other. Oscar is rated aggressive and Marbled Hatchetfish is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Marbled Hatchetfish: 60L. Group minimum 6 (schooling).
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 60L hub.
Easier alternatives to consider
Hardier first-tank names from the library. Still read the profile. Not a substitute for reading this one.
Plan before you buy
Start a pair check with Marbled Hatchetfish, or open a starter plan with the top safer companions in the builder.
Tank hubs: 60L
Related reading
Guides that list other fish with the same trait, so you can plan around the group rather than one row.
- Schooling & group fish →
Plan the group of 6+ before choosing tank mates.
- Peaceful community fish →
Other peaceful species to shortlist beside Marbled Hatchetfish.
- Fish for smaller tanks →
Marbled Hatchetfish fits the small-tank filter — check volume hubs before you buy.
Filtration & heating
A 60L minimum tank for Marbled Hatchetfish needs a filter rated for at least 240L/hr turnover and a heater maintaining 24–28°C.
Similar fish (same category)
- American Flagfish · min 60L
- Golden Wonder Killifish · min 80L
- Pea Puffer · min 40L
- Clown Killifish · min 20L
- African freshwater butterflyfish · min 150L
- Ropefish / reed fish · min 200L
- Senegal bichir · min 300L
- Black ghost knifefish · min 500L
Related (care + temperament)
Featured compatibility checks
Curated pair pages for Marbled Hatchetfish. Each opens a full verdict — not just a list label.
Marbled Hatchetfish tank mates — quick answers
- What fish can live with Marbled Hatchetfish?
- Usually safer companions on this hub include Cardinal Tetra, Rummy Nose Tetra. Open each pair check before you buy — the list is a shortlist, not a guarantee.
- What tank mates should you avoid with Marbled Hatchetfish?
- Avoid Oscar based on size, temperament, or predation risk on this profile.
- What size tank do Marbled Hatchetfish need for a community?
- 60L is the planning floor for adult swimming space and bioload. A 80L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.