Tinfoil Barb
Barbonymus schwanenfeldii
Min Tank Size
750L
Adult Size
35 cm
Lifespan
10 years
School Size
5+
About
Native to the river systems of Southeast Asia, including the Mekong, Chao Phraya, and Malay Peninsula drainages, tinfoil barbs are a species that commands attention the moment they enter a tank. Their bodies are bright silver with a metallic sheen that genuinely earns the "tinfoil" name, and those vivid red-orange fins make them unmistakable.
Juveniles sold at fish stores are usually only 5 to 8 cm, which fools a lot of beginners into thinking they're buying a manageable community fish. They're not. These fish grow fast and push 30 to 35 cm in captivity with good feeding. That means you need serious tank space, typically 530 liters as a minimum for a small school, and larger is always better. Water conditions should stay between 22 and 27 degrees Celsius, with a pH of 6.0 to 7.5 and moderate hardness. Strong filtration is non-negotiable given their bioload.
They're enthusiastic omnivores with a heavy lean toward plant material. Lettuce, spinach, zucchini, spirulina-based pellets, and quality flakes all work well. Live or frozen foods like bloodworm and daphnia are accepted readily too. The plant-eating habit means you can basically forget a planted aquascape with these fish unless you're using hard-leaved species anchored in pots.
Temperamentally, tinfoil barbs are genuinely peaceful despite their size. They don't nip, don't bully, and get along well with similarly large, robust tankmates. What causes problems isn't aggression, it's the sheer chaos of a school of 35 cm fish moving at speed through a confined space. Smaller or more delicate fish simply don't belong in the same setup.
If you want to see how hobbyists actually house this species and what real large-fish setups look like, browse tank builds featuring tinfoil barbs on Shimmerscape.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Tinfoil Barb together
Tinfoil Barb are shoaling fish and need company of their own kind. Keep a group of at least 5. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Tinfoil barbs need large, robust tankmates that won't be outcompeted or overwhelmed. Good matches include oscars, large gouramis, clown loaches, bichirs, and other similarly sized barbs or cichlids that can handle the activity level. Avoid anything small enough to be swallowed, including most shrimp, small tetras, and nano fish. Peaceful bottom dwellers like large plecos and synodontis catfish coexist well since they occupy different zones. The real limiting factor is tank size. In anything under 530 liters a group of adults simply has no good companions.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The biggest mistake people make with tinfoil barbs is buying juveniles for a community tank without planning for adult size. A 5 cm fish in a pet store will be 25 cm within a couple of years. Filtration needs to handle their considerable waste output, so oversized external canister filters or sump setups are strongly recommended. They're also enthusiastic jumpers, so gaps in the lid matter. Diet is easy, they accept almost anything, but plant-heavy foods should form the bulk of their meals to support digestion and keep them in good condition.
Behavior & Aggression
Tinfoil barbs are not aggressive fish. They don't fin nip, they don't establish territories, and conspecific squabbles are basically unheard of in a properly sized school. The only real issue is their size and speed. A large school churning through a tank creates turbulence and stress for smaller or slower species, and they may accidentally outcompete calmer tankmates at feeding time. None of that is aggression in the traditional sense, but the practical outcome can be similar if your tank mix isn't well thought out.
Things to Know
- Grows to 35 cm, most buyers seriously underestimate the tank size needed.
- Will uproot and consume most aquatic plants, avoid planted setups.
- Needs to be kept in groups of 5+, lone fish become stressed and skittish.
- Powerful swimmers, a secure lid is essential as they can jump.
- Grows very large, up to 35 cm.
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