Bala Shark
Balantiocheilos melanopterus
Min Tank Size
550L
Adult Size
35 cm
Lifespan
10 years
School Size
4+
About
Native to the river systems of Southeast Asia, including the Mekong, Chao Phraya, and Malay Peninsula basins, bala sharks are one of those fish that trick people with their juvenile appearance. At the store they're maybe 5 cm, torpedo-shaped, and irresistibly cute. A year later you've got a 30 cm fish that's outgrown everything.
They're striking animals. The body is bright silver with a slightly compressed, almost fusiform shape, and every fin is edged in bold black and white banding that gives them that unmistakable shark-like silhouette. They're not related to sharks at all, of course, but the common name has stuck for obvious reasons. In a large, well-lit aquarium, a school of adults is genuinely breathtaking.
Water parameters are fairly flexible. They do well in temperatures from 22 to 28 Celsius, pH between 6.5 and 7.8, and moderate hardness. Filtration needs to be robust since these are big, active fish with a corresponding bioload. They appreciate some current and open swimming space far more than dense planting or decor.
Diet is easy enough: they're omnivores that readily accept flake, pellet, frozen foods like bloodworm and brine shrimp, and occasional vegetable matter. If you want to see how other hobbyists have housed a full-grown school, shimmerscape has real tank builds from people who've actually done it right. Worth browsing before you commit.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Bala Shark together
Bala Shark are shoaling fish and need company of their own kind. Keep a group of at least 4. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Bala sharks pair well with other large, active fish that can hold their own in fast-moving water. Bigger tetras like Colombian or Buenos Aires tetras, giant danios, larger rasboras, rainbowfish, and medium-to-large cichlids that aren't overly aggressive are all solid choices. Peaceful bottom dwellers like large plecos or Synodontis catfish work well too since balas primarily occupy the mid and upper zones. Avoid pairing them with slow, delicate species like fancy bettas or long-finned angelfish that may be stressed by the constant activity. Dwarf shrimp will almost certainly be eaten. Small nano fish are risky as unintentional snacks.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The biggest mistake is underestimating adult size. Most people buy them for a 200-liter tank thinking they'll upgrade later, then don't. A proper long-term setup needs at minimum 530 liters with significant horizontal length. They also need groups of at least four or they become chronically stressed and dart into glass. Filtration must handle their bioload, so oversized canister filters are standard. Feeding a variety of foods keeps them in good condition since relying only on flake leads to nutritional gaps over time. Lids are non-negotiable.
Behavior & Aggression
Bala sharks are genuinely peaceful and show no meaningful aggression toward tankmates. They don't nip fins, they don't harass smaller fish intentionally, and they have no territorial instincts worth mentioning. The main concern is their sheer size and energy. A spooked school bolting around a tank can stress or physically jostle smaller, calmer fish. They'll also consume anything small enough to fit in their mouth, which includes shrimp and fry, though this is predation rather than aggression.
Things to Know
- Commonly sold at 5 cm but grows to 35 cm, needs a 6+ foot tank long-term.
- Must be kept in groups of 4 or more, singles and pairs become stressed and skittish.
- Powerful jumpers, a tight-fitting lid is essential.
- Will eat small shrimp and fish fry that fit in their mouth.
- Near-threatened in the wild, most available stock is captive-bred.
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