Should I buy it?
Lambchop / Espei rasbora
Trigonostigma espei
Also known as: lambchop rasbora, espei rasbora, false harlequin
A 3.5 cm orange rasbora with a shoulder marking shaped like a lambchop cut. Very peaceful, schools tightly, and works in almost any soft-water community.
Lambchop / Espei rasbora tank mates · 60L tank size hub
peaceful · beginner care
Sources & confidencehigh · partially verified · beginner: excellent
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Planted community tanks 60L or more with soft neutral water and a school of ten or more.
Avoid if: You keep any fish over 8 cm that might treat nano fish as a snack.
Common mistakeBuying five lambchop rasboras for a tank already packed with danios or tiger barbs is how the school disappears from view. They need roughly eight or more and calm company; active competitors steal food and the group fades to glass-hugging beige. Start the school first, then add quieter neighbours.
Top things that go wrong
- Group welfare — not a solo display fish. Plan at least **8** together for normal behaviour; smaller groups often mean stress, colour loss, or nipping depending on species.
- Shrimp & snails. Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
What most shops don't tell you
- 1.Shops sell lambchop rasboras as hardy community rasboras for any small tank. They are peaceful, but they still need a proper school and freedom from midwater bullies. Five fish in a busy 60L is a shop count, not a finished plan.
- 2.Confusing it with the true harlequin in shops with mislabelled stock.
- 3.Housed with extremely acidic blackwater-only species without a transition plan.
- 4.A school of eight or more shows the colour. Plant cover and a stable warm temperature deepen it. Do not keep with tiger barbs in a small volume.
About this species
Lambchop rasboras are a smaller, copper-toned relative of the harlequin, with a deeper wedge that names the species. Peaceful midwater fish that read against dark substrate and low plants.
- Cherry Barb60L min · same group, comparable tank size
- Dwarf pencilfish60L min · same group, comparable tank size
- Harlequin Rasbora60L min · same group, comparable tank size
- Zebra Danio60L min · same group, comparable tank size
- Golden / Beckford's pencilfish80L min · same group, similar adult size
- Pearl Danio80L min · same group, similar adult size
- White Cloud Mountain Minnow40L min · same group, similar adult size
- Celestial Pearl Danio30L min · same group, similar adult size
- Amano Shrimpalso beginner peaceful, similar tank size
- Assassin Snailalso beginner peaceful, similar tank size
- Beckford Pencilfishalso beginner peaceful, similar tank size
- Black Neon Tetraalso beginner peaceful, similar tank size
- Black phantom tetraalso beginner peaceful, similar tank size
- Bloodfin tetraalso beginner peaceful, similar tank size
No reverse lookups listed yet.
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease82
- Peacefulness90
- Community fit90
- Small-tank fit100
- Hardiness76
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Rough 90L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safer directions include: Chili Rasbora, Dwarf Gourami, Ember Tetra.
Prioritise 8+ of Lambchop / Espei rasbora in 60L+ with filtration sized for messy feeding — add only mates that already pass pair checks with this species.
Compatibility
Tank mates for Lambchop / Espei rasbora
Usually safer (engine GOOD): Chili Rasbora, Dwarf Gourami, Ember Tetra, Neon Tetra, Pygmy Corydoras. Conditional (CAUTION — read the pair page before buying): Betta, Corydoras Catfish, German Blue Ram, Tiger Barb. Avoid (RISKY): African Cichlid, Green Terror, Jack Dempsey, Oscar. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Lambchop / Espei rasbora + Chili Rasbora
- Try Chili Rasbora — open the pair check.
- Try Dwarf Gourami — open the pair check.
- Try Ember Tetra — open the pair check.
- Try Neon Tetra — open the pair check.
Behaviour and temperament
Lambchop rasboras are calm midwater schoolers that colour up and hold formation when numbers are honest. They do not police the tank. Stress and washout usually mean under-stocking or competition, not a bad strain.
What sets them off
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: Not a predator toward similarly sized community fish; fry and dwarf shrimp are still fair game for most species.
Territory: Not strongly territorial, but still needs room so its working space does not overlap the next fish.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- Eight or more form a tight midwater shoal with a clear black wedge on each fish.
- They stay calmer in planted tanks than in bare, high-flow layouts.
- Beige, scattered fish hugging the glass usually need more of their own kind first.
- Losing every feed to danios or barbs is a competition problem, not picky appetite.
- Low listed risk — they almost never start community fights.
- In-school sparkle and chase is normal sorting inside a proper group.
- Pull them from any tank where active barbs own the midwater and the school never feeds.
- Increase group size before you add another “dither” species to fix hiding.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
soft
Diet
omnivore
Lambchop rasboras take micro-pellets and fine flake without drama but lose out to frantic surface feeders. Feed a midwater pinch they can reach, and add tiny frozen foods a few times a week so the black wedge and orange body stay vivid. Soft, planted water with gentle flow shows better condition than a hard, bare community race.
Shrimp & snails
Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
Schooling species — buy 8+ together. Smaller groups stress and lose colour.
- Hold 23 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 5 to 7 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Schooling species. Buy 8 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 60L published minimum for adults.
- You can stock at least 8 individuals (group welfare).
- Heater can hold 23–28°C without cooking cooler-water tank mates.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 60L minimum tank needs a filter rated for at least 240L/hr turnover and a heater to hold 23–28°C reliably.
Plant suggestions
Lambchop / Espei rasbora does well in planted tanks. Plants compatible with 23–28°C and pH 5–7:
Research: partially verified · Confidence: high · 3 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Trigonostigma espei
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Trigonostigma espei
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Trigonostigma espei
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Common questions about Lambchop / Espei rasbora
- How big do Lambchop / Espei rasbora get?
- Lambchop / Espei rasbora adults reach about 3.5 cm. Shop fish look smaller; stock for the adult length.
- What size tank does Lambchop / Espei rasbora need?
- 60L is the planning floor for adult swimming space and bioload. A 73L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Lambchop / Espei rasbora aggressive?
- Lambchop rasboras are calm midwater schoolers that colour up and hold formation when numbers are honest. They do not police the tank. Stress and washout usually mean under-stocking or competition, not a bad strain.
- Do Lambchop / Espei rasbora need to be kept in a group?
- Schooling species — buy 8+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Lambchop / Espei rasbora?
- Buying five lambchop rasboras for a tank already packed with danios or tiger barbs is how the school disappears from view. They need roughly eight or more and calm company; active competitors steal food and the group fades to glass-hugging beige. Start the school first, then add quieter neighbours.
- What fish can live with Lambchop / Espei rasbora?
- The Lambchop / Espei rasbora profile lists Chili Rasbora, Dwarf Gourami, Ember Tetra, Neon Tetra among its safer pairings (engine-checked GOOD). Betta, Corydoras Catfish, German Blue Ram, Tiger Barb are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid African Cichlid, Green Terror, Jack Dempsey, Oscar (RISKY). Run the pair checker for your exact water and tank size before stocking.