Should I buy it?
Denison's / red-line torpedo barb
Sahyadria denisonii
Also known as: denison barb, red-line torpedo barb, roseline shark, miss kerala, denisons barb
A spectacular 12 cm red-stripe torpedo barb that needs a real school in a long tank. Conservation-sensitive and demanding; not an impulse purchase.
Denison's / red-line torpedo barb tank mates · 250L tank size hub
peaceful · intermediate care
Sources & confidencehigh · partially verified · beginner: caution
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: Large planted tanks 250L or more with a school of six, real flow, and medium-hard water.
Avoid if: Your tank is under 150 cm in length, water is soft and acidic, or you can only find one or two fish.
Common mistakeBuying one or two Denison's barbs as a centrepiece is how keepers invent a glass-pacing loner that never settles. They school or they stress. Plan six or more in a long 250L-class footprint, prefer tank-bred stock, and skip the solo 'torpedo' impulse buy.
Top things that go wrong
- Group welfare — not a solo display fish. Plan at least **6** 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.Myth: one Denison's barb makes a striking peaceful centrepiece in a mixed community. Reality: they need a real school of six or more and long swimming space — solo fish pace under stress, and wild populations are under pressure so prefer tank-bred sources.
- 2.Endangered in the wild. Prefer tank-bred sources where available.
- 3.Large minimum volumes still need real footprint: length and width for turning matter as much as the litre number on a sticker.
- 4.Bought as a juvenile show fish for a 100L. The 5 cm juvenile is a 12 cm adult within two years and the tank fails to hold the shoal.
- 5.Kept at tropical 27 C with discus or angelfish. The colour washes out and the fish become listless inside months.
- 6.Kept in low-oxygen, stagnant corner tanks. Fish fade and gasp at the surface.
- 7.Purchased as a 'small' barb in juveniles without a long-tank adult plan.
- 8.Not a fish for a first 60 L community. Plan 250 litres or more, strong filtration, and regular large water changes. A school of six or more spreads aggression and brings up colour.
About this species
Denison barbs are torpedo-shaped cyprinids from fast hill streams of the Western Ghats, marked by a red shoulder line. They need a long mature tank, strong flow, and cool oxygen-rich water more than most community barbs.
- Banded leporinus300L min · same group, comparable tank size
- Giant danio200L min · same group, comparable tank size
- Rainbow / red-tailed black shark200L min · same group, comparable tank size
- Silver dollar300L min · same group, comparable tank size
- Rosy Barb180L min · same group, similar adult size
- Scissortail Rasbora150L min · same group, similar adult size
- Gold / Chinese barb120L min · same fish family
- Odessa Barb120L min · same group, similar adult size
- African freshwater butterflyfishalso intermediate peaceful, similar tank size
- Boesemani Rainbowfishalso intermediate peaceful, similar tank size
- Congo Tetraalso intermediate peaceful, similar tank size
- Cuckoo / petricola catfishalso intermediate peaceful, similar tank size
- Dojo / weather loachalso intermediate peaceful, similar tank size
- Giant danioalso intermediate peaceful, similar tank size
- Bala / silver shark tank mateslists this fish as a safe and recommended mate
- Giant danio tank mateslists this fish as a safe and recommended mate
- Tinfoil barb tank mateslists this fish among its recommended pairings
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 ease22
- Peacefulness90
- Community fit79
- Small-tank fit83
- Hardiness54
- Energy86
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.
Prioritise 6+ of Denison's / red-line torpedo barb in 250L+ with filtration sized for messy feeding — add only mates that already pass pair checks with this species.
Compatibility
Tank mates for Denison's / red-line torpedo barb
Usually safer (engine GOOD): Bala / silver shark, Bristlenose Pleco, Giant danio. Conditional (CAUTION — read the pair page before buying): Boesemani Rainbowfish, Corydoras Catfish, Neon Tetra, Pea Puffer, Tiger Barb. Avoid (RISKY): African Cichlid, Discus, German Blue Ram, 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: Denison's / red-line torpedo barb + Bala / silver shark
Behaviour and temperament
Denison's barbs are generally peaceful but highly active schoolers. They stay calmer in six or more with real length. Stress shows as endless pacing and nervous neighbours when kept as one or two in a short display Plan the husbandry before the shop impulse buy.
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
- Six or more cruise a long tank with red-line flanks flashing in formation.
- High activity is normal ownership — plan length, not just a litre sticker.
- Solo glass pacing means school size failed before food brand.
- Torn fins after rough barbs or short tanks mean the mix or footprint failed.
- Low malice toward robust similarly active fish in an honest school.
- Under-grouped fish redirect stress into frantic swimming more than fin wars.
- Grow the school and footprint before adding another centrepiece.
- Rehome a loner rather than hoping one friend fixes months of pacing.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium-hard
Diet
omnivore
Denison's barbs are active midwater omnivores that take quality flake, pellets, and frozen foods in a school of six or more. Sparse feeding in a short tank leaves shy fish thin while the group paces. Offer staple across the length of a 250L-class long tank so the whole school reaches meals.
Shrimp & snails
Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
Six or more in a 250L+. Pairs and trios pace the front glass and never colour up.
- A 250L tank with at least 120 cm of forward length.
- Hold 15 to 25 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 6.5 to 7.5 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 6 or more from the same tank on the same day before adding any centrepiece fish.
- Tank mates that match the cool-water preference; skip discus and angels.
- Tank volume meets or exceeds 250L published minimum for adults.
- You can stock at least 6 individuals (group welfare).
- Heater can hold 15–25°C without cooking cooler-water tank mates.
- No known fin-nippers paired with long-finned fish unless you accept documented risk.
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 250L minimum tank needs a filter rated for at least 1000L/hr turnover and a heater to hold 15–25°C reliably.
Plant suggestions
Denison's / red-line torpedo barb does well in planted tanks. Plants compatible with 15–25°C and pH 6.5–7.5:
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. Sahyadria denisonii
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Sahyadria denisonii
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Sahyadria denisonii
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
- Sahyadria denisonii is classified as endangered in its native range due to wild collection. The trade is now mostly tank-bred from commercial breeders; ask shops for the source if conservation matters to you.
- Cool water (18 to 23 C) is the surprise factor. Most shop tanks run them at 26 C, which they tolerate but do not thrive in. A drop to 22 C reveals the full red line.
- 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.
- 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.
Featured compatibility checks
Curated pair pages for Denison's / red-line torpedo barb. Each opens a full verdict — not just a list label.
Common questions about Denison's / red-line torpedo barb
- How big do Denison's / red-line torpedo barb get?
- Denison's / red-line torpedo barb adults run about 10–15 cm. In home tanks they usually land near 12 cm — plan space and filtration for that, not the juvenile in the shop bag.
- What size tank does Denison's / red-line torpedo barb need?
- 250L is the planning floor for adult swimming space and bioload. A 300L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Denison's / red-line torpedo barb aggressive?
- Denison's barbs are generally peaceful but highly active schoolers. They stay calmer in six or more with real length. Stress shows as endless pacing and nervous neighbours when kept as one or two in a short display Plan the husbandry before the shop impulse buy.
- Do Denison's / red-line torpedo barb need to be kept in a group?
- Six or more in a 250L+. Pairs and trios pace the front glass and never colour up.
- What is the most common mistake with Denison's / red-line torpedo barb?
- Buying one or two Denison's barbs as a centrepiece is how keepers invent a glass-pacing loner that never settles. They school or they stress. Plan six or more in a long 250L-class footprint, prefer tank-bred stock, and skip the solo 'torpedo' impulse buy.
- What fish can live with Denison's / red-line torpedo barb?
- The Denison's / red-line torpedo barb profile lists Bala / silver shark, Bristlenose Pleco, Giant danio among its safer pairings (engine-checked GOOD). Boesemani Rainbowfish, Corydoras Catfish, Neon Tetra, Pea Puffer are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid African Cichlid, Discus, German Blue Ram, Oscar (RISKY). Run the pair checker for your exact water and tank size before stocking.