Panda cory

Quick facts

Adult size

5 cm

Lifespan

can live up to 10 years; captive average 5-8 years in proper conditions

Tank zone

bottom

Temperament

peaceful

Difficulty

intermediate

Schooling

recommended 6+ (critical minimum 4, thrives at 8+)

Water parameters

Temperature

20–25°C

pH

6.0 to 7.5

Hardness

2 to 12 dGH

Tank requirements

Minimum volume

75 L

Minimum length

60 cm

Flow

low

Lighting

dim preferred

Substrate

sand required

Driftwood

preferred

Hiding spots

needed

Feeding

Diet: omnivore, feeds primarily at the bottom.

Sinking pellets and wafers are the dietary staple. They're omnivores that eat whatever reaches the bottom: crushed flake, sinking granules, frozen bloodworm, frozen brine shrimp, frozen daphnia, and live blackworms. Algae wafers are taken but aren't a significant food source. The common misconception that corys are "cleanup crew" that survive on leftovers is harmful. They need targeted feeding with sinking food, not just scraps from surface feeders. Drop sinking pellets after lights-out if daytime competition from midwater fish is a problem. Panda corys are less assertive at feeding time than bronze or peppered corys; they'll lose out if larger catfish or loaches are in the tank. One or two small sinking pellets per fish daily, supplemented with frozen food 2-3 times a week.

Compatibility

• Peaceful bottom-dweller that pairs well with anything that won't eat it. Classic community fish with tetras, rasboras, guppies, and other small peaceful species.
• Keep in groups. Corydoras are social catfish and panda corys show the most natural behavior in groups of 6 or more. A solo cory hides constantly and often stops eating. Even 3 is noticeably less active than 6.
• Can be mixed with other Corydoras species in the same tank. They tend to school with their own kind when given the choice, but mixed-species cory groups still show more activity than same-species groups that are too small.
• Barbel damage is a real concern. Panda corys constantly nose through the substrate foraging for food. Coarse gravel wears down the barbels over months, leading to bacterial infections and impaired feeding ability. Sand is the correct substrate for any Corydoras tank.

Habitat

Native to the Ucayali River system in Peru, a tributary of the upper Amazon. The type locality is near the town of Leticia. Wild populations are found at higher elevation than most corys (around 300–500 m above sea level), in cooler, faster-moving water than the lowland species. This is reflected in the species' preference for slightly cooler temperatures than most tropical fish: 20–25°C is the comfort zone, and they do poorly in tanks consistently above 26°C. The black-and-white "panda" pattern (black eye patch, black dorsal saddle, black caudal peduncle blotch on a pale pinkish-white body) makes them one of the most recognizable corys in the hobby. The name is obvious and memorable, which helped their popularity. First described by Nijssen and Isbrucker in 1971 and entered the aquarium trade in the late 1970s. Now bred commercially in large numbers, though wild-caught specimens still appear in shipments. Tank-bred pandas are significantly hardier than wild-caught ones, which are often stressed and thin on arrival.

Breeding

Spawns in aquariums with moderate difficulty. The classic Corydoras breeding trigger works: a large cool water change (drop temperature 3–4°C below normal) combined with a low-pressure weather system or simply reduced temperature over 48 hours. This simulates the onset of the rainy season in their native range. Condition the group with frozen bloodworm and high-protein sinking food for 2 weeks before attempting. The T-position mating ritual is standard Corydoras: the female clamps the male's barbels between her pelvic fins, and he releases sperm which she directs to fertilize 2-4 eggs held in her pelvic fin pouch. She then deposits the adhesive eggs on a flat surface (glass, leaves, filter intakes). The process repeats for 1-3 hours, producing 20-40 eggs total. Eggs hatch in 4-5 days at 22°C. Fry are delicate for the first week and need fine food (microworms, baby brine shrimp). Compared to bronze or peppered corys, panda cory clutches are smaller and the fry grow slower, which is why they're more expensive in stores.

Common problems

Sensitivity to high temperatures. Panda corys come from cooler Andean streams and don't tolerate sustained heat well. Tanks above 26–27°C cause stress, increased susceptibility to disease, and shortened lifespan. In community tanks kept at 25–26°C for tropical tankmates, pandas are fine but at the upper edge of their comfort. Paired with discus or other heat-loving fish at 28–30°C, they'll decline. Barbel erosion from gravel substrates is the other big issue (covered above). Bacterial fin rot and body fungus appear when water quality slips, and corys are often among the first fish to show symptoms because they're in constant contact with the substrate where organic waste accumulates. Keep the substrate clean with regular vacuuming. Salt treatments at standard doses are tolerated, but corys lack the thick scale armor of most fish, so chemical treatments should start at half dose. Wild-caught panda corys have a reputation for dying within the first few weeks of purchase; if buying wild-caught, quarantine in a clean tank and feed heavily to rebuild condition.

Bioload

Bioload coefficient: 1.8 (5 cm bottom dweller; size formula gives 1.75, bumped slightly because corys constantly forage and disturb substrate).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• Stocking ideas by tank size