The iridescent shark (Pangasianodon hypophthalmus) is a giant freshwater catfish, not a suitable community fish for an ordinary home aquarium. Juveniles are widely sold at only a few inches long, but adults can exceed a meter and need an enormous permanent system.
Why the adult commitment is different
This is an active, open-water, social fish. Keeping one in a small tank does not solve its group or swimming needs. Albino fish grow large too, and the attractive juvenile coloration does not remain unchanged through adulthood.
Seriously Fish illustrates the scale with a 4.5 × 1.8 × 1.8-meter enclosure even for one adult. That is over 14,000 liters, before planning an appropriate group. A generic 500-gallon recommendation is not a dependable lifetime solution.
Only buy when the permanent facility already exists. Public aquariums and retailers can refuse rehoming requests. Growth restriction in a small tank is not a safe method of keeping the fish manageable.
Existing fish need specialist planning
A long-term system needs extensive open swimming space, protected equipment, secure containment and safe access for maintenance. Startling fish can collide with walls and furnishings, so layout and handling require care. Plan structural loading, drainage, filtration and emergency power before treating a large water volume as adequate housing.
Use substantial mechanical and biological filtration with oxygenation and accessible waste removal. Maintain zero ammonia and nitrite and monitor nitrate. A large enclosure still needs regular maintenance; supposed hardiness does not justify exposure to toxic waste.
A reference temperature is 22–26°C (72–79°F), with pH around 6.5–7.5 and suitable stable chemistry. Match the established stock and avoid abrupt changes.
Food and companions
Offer an appropriate varied omnivorous diet, with prepared foods and aquatic ingredients matched to age and size. Confirm consumption without leaving large quantities to decay. Live feeder fish are unnecessary.
Small fish and invertebrates may be eaten. Other giant fish are not automatically safe companions: predation, intimidation, swimming space and combined waste load all need assessment. Do not buy arowanas or stingrays simply to populate an already demanding enclosure.
Use a suitably scaled quarantine arrangement for additions. Investigate white spots, breathing changes or injuries before treatment rather than assuming all fish from farms carry the same disease.
A more realistic choice
Commercial pond breeding does not make this an accessible home breeding project. For most aquarists, the right decision is to choose a smaller species from the outset. Compare the adult requirements in our aquarium catfish guide, and never release an unwanted fish.
