Should I buy it?
Bala / silver shark
Balantiocheilos melanopterus
Also known as: bala shark, tricolor shark, silver shark
Grows to 35 cm and needs a school. Juvenile 5 cm 'sharks' are irresistible in shops. The adult fish needs 500L or more and eats small fish.
Bala / silver shark tank mates · 300L tank size hub
peaceful · intermediate care
Sources & confidencehigh · partially verified · beginner: not recommended
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 tanks 500L or more with a school of five or more and large peaceful companions over 15 cm.
Avoid if: Any tank under 300L, nano fish, or if you can't plan for a 35 cm adult over several years.
Common mistakeBuying three cute bala sharks for a 100L community is the classic outgrow-and-eat story. Adults push toward 35 cm, need a huge footprint, and will take nano fish once the mouth catches up. This is a public-aquarium-scale school fish, not a silver tetra for a living-room kit.
Top things that go wrong
- Grows large or needs a very big footprint. Bala / silver shark is often sold at sizes that hide adult length (~35cm) and a published minimum near **500L**. Shop tanks are not adult housing.
- Mouth gap vs tiny tank mates. May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
- Shrimp & snails. Not shrimp-safe — adults, fry, or both get eaten.
What most shops don't tell you
- 1.Shops sell juvenile bala sharks as peaceful community sharks that stay manageable. They do not. Growth is fast, nano fish disappear, and the peaceful label does not shrink adult space needs. A silver flash in a 60L is a future rehoming ad.
- 2.Bought in trios in 200 L and never upgraded as they hit 20 cm or more within a year or two.
- 3.Housed with slow coldwater fish whose temperature window splits from the bala's in summer.
- 4.Plan for a 180 cm footprint or more. Balas burn through oxygen, can jump, and are not a nanofish community option.
About this species
Bala sharks are large active minnows that look 'shark-like' in the shop but grow to 30 to 35 cm. They are peaceful, but the mix of size, swim speed, and a strong jump makes them a long-tank specialist, not a community fish.
- Tinfoil barb500L min · same group, comparable tank size
- Banded leporinus300L min · same fish family
- Silver dollar300L min · same fish family
- Denison's / red-line torpedo barb250L min · same fish family
- Giant danio200L min · same fish family
- Rainbow / red-tailed black shark200L min · same fish family
- Rosy Barb180L min · same fish family
- Scissortail Rasbora150L min · same fish family
- Clown Loachalso intermediate peaceful, similar tank size
- Common Plecoalso intermediate peaceful, similar tank size
- Denison's / red-line torpedo barbalso intermediate peaceful, similar tank size
- Pictus catfishalso intermediate peaceful, similar tank size
- Silver dollaralso intermediate peaceful, similar tank size
- Tinfoil barbalso intermediate peaceful, similar tank size
- African freshwater butterflyfish tank matesnames this fish as a conditional pairing — read the pair page conditions
- Black ghost knifefish tank matesnames this fish as a conditional pairing — read the pair page conditions
- Denison's / red-line torpedo barb tank mateslists this fish as a safe and recommended mate
- Giant danio tank mateslists this fish as a safe and recommended mate
- Jaguar cichlid tank matesnames this fish as a conditional pairing — read the pair page conditions
- Pictus catfish tank mateslists this fish as a safe and recommended mate
- Rainbow / red-tailed black shark tank matesnames this fish as a conditional pairing — read the pair page conditions
- Ropefish / reed fish tank mateslists this fish as a safe and recommended mate
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 ease24
- Peacefulness76
- Community fit73
- Small-tank fit38
- 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.
Match temperature and pH overlap with every tank mate, then verify adult size and group rules on pair pages — Fishori is biased toward boring, survivable plans.
Compatibility
Tank mates for Bala / silver shark
Usually safer (engine GOOD): Boesemani Rainbowfish, Denison's / red-line torpedo barb, Giant danio, Tinfoil barb. Conditional (CAUTION — read the pair page before buying): Betta, Corydoras Catfish. Avoid (RISKY): Chili Rasbora, Ember Tetra, Guppy, Neon Tetra, Pea Puffer. 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: Bala / silver shark + Boesemani Rainbowfish
Behaviour and temperament
Bala sharks are peaceful toward similar-sized fish and overwhelming toward everything smaller by sheer size and speed. They school and stay calmer in a proper group of five or more. The damage they do is usually to stocking plans, not to a spite chart.
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: May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
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
- A group of five or more patrols open midwater in a long, deep tank.
- Constant swimming is normal; a lone bala often paces and looks “stressed.”
- Pacing in a short community tank means the footprint failed months before adult length.
- A thin group that harasses small fish is under-stocked for a large schooling species.
- Low listed malice; adult size still makes tiny neighbours food or collision risks.
- In-school sorting looks rough and is still better than a lone giant in a nano.
- Rehome before adult size if the tank cannot reach true large-shark dimensions.
- Pull nano fish the first week disappearances start after lights-out.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium
Diet
omnivore
Bala sharks are large, active omnivores that clear midwater food in seconds. Quality omnivore staples, vegetable matter, and frozen foods in real quantities matter; a tetra-sized pinch leaves them scavenging décor. Feed a group evenly so the largest fish does not monopolise every meal.
Shrimp & snails
Not shrimp-safe — adults, fry, or both get eaten.
Schooling species — buy 5+ together. Smaller groups stress and lose colour.
- Hold 22 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 6 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 5 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 500L published minimum for adults.
- You can stock at least 5 individuals (group welfare).
- Heater can hold 22–28°C without cooking cooler-water tank mates.
- No known fin-nippers paired with long-finned fish unless you accept documented risk.
- No tank mates small enough to fit the adult mouth gap for this species.
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 500L minimum tank needs a filter rated for at least 2000L/hr turnover and a heater to hold 22–28°C reliably.
Plant suggestions
Bala / silver shark does well in planted tanks. Plants compatible with 22–28°C and pH 6–7.5:
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. Balantiocheilos melanopterus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Balantiocheilos melanopterus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Balantiocheilos melanopterus
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.
Featured compatibility checks
Curated pair pages for Bala / silver shark. Each opens a full verdict — not just a list label.
Common questions about Bala / silver shark
- How big do Bala / silver shark get?
- Bala / silver shark adults run about 30–35 cm. In home tanks they usually land near 35 cm — plan space and filtration for that, not the juvenile in the shop bag.
- What size tank does Bala / silver shark need?
- 500L is the planning floor for adult swimming space and bioload. A 600L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Bala / silver shark aggressive?
- Bala sharks are peaceful toward similar-sized fish and overwhelming toward everything smaller by sheer size and speed. They school and stay calmer in a proper group of five or more. The damage they do is usually to stocking plans, not to a spite chart.
- Do Bala / silver shark need to be kept in a group?
- Schooling species — buy 5+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Bala / silver shark?
- Buying three cute bala sharks for a 100L community is the classic outgrow-and-eat story. Adults push toward 35 cm, need a huge footprint, and will take nano fish once the mouth catches up. This is a public-aquarium-scale school fish, not a silver tetra for a living-room kit.
- What fish can live with Bala / silver shark?
- The Bala / silver shark profile lists Boesemani Rainbowfish, Denison's / red-line torpedo barb, Giant danio, Tinfoil barb among its safer pairings (engine-checked GOOD). Betta, Corydoras Catfish are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid Chili Rasbora, Ember Tetra, Guppy, Neon Tetra (RISKY). Run the pair checker for your exact water and tank size before stocking.