Peppered Corydoras Care
Short answer: Peppered corydoras (Corydoras paleatus) are the cold-hardy cory — a subtropical species comfortable in cooler, even unheated tanks (64-78°F). Keep at least six on soft sand in a 20-gallon. A bombproof classic beginner cory; across real tanks keepers run a median of 3-4 in a 20-gallon.
Peppered corydoras at a glance
- Scientific name
- Corydoras paleatus
- Adult size
- ~2.8″
- Temperature
- 64–78°F
- pH
- 6–7.5
- Minimum tank
- 20 gal
- Temperament
- peaceful
- Social
- schooling — keep 6+
- Reference
- Wikipedia
Peppered corydoras (Corydoras paleatus, recently reclassified Hoplisoma paleatum1) are one of the oldest and hardiest aquarium corys — and the one that genuinely prefers cooler water. They come from subtropical southern South America, so they shrug off temperatures that would stress a tropical cory.
A peaceful, bottom-dwelling shoaling catfish; keep a group of at least six on soft sand in a 20-gallon or larger tank.2
Peppered corydoras at a glance
| Attribute | Authority | Real tanks (AquaGauge) |
|---|---|---|
| Adult size | ~7 cm (2.5 in)2 | — |
| Temperature | 64–78 °F (18–26 °C)1 | genus median 78 °F (warm end) |
| pH | 6.0–7.52 | genus median 7.5 |
| Minimum group | 6+2 | median 3–4 in a 20-gal (10 of 20 tanks) |
| IUCN status | Least Concern1 | — |
Authority = recommended ranges for C. paleatus (FishBase gives a subtropical wild range of 18–23 °C). "Real tanks" = our peppered stocking data (20 tanks) + genus-level corydoras water (median 78 °F / pH 7.5) — note 78 °F sits at the warm end for this cooler-water species. Figures are from the July 2026 snapshot (6,414 tanks total).
The cold-hardy cory
Peppered corys are subtropical, native to Argentina, Uruguay and southern Brazil, where water runs 18–23 °C (64–73 °F) in the wild.1 In the aquarium they are happy across a wide 64–78 °F (18–26 °C)2 — which makes them the one common cory you can keep in a cooler or unheated room-temperature tank. They are a natural match for other subtropical fish like white cloud mountain minnows. (For the opposite end of the range, the sterbai corydoras is the warm-water cory, and the panda corydoras sits in the middle.)
How many, and tank size
Keep at least six — peppered corys are social shoalers that forage in the open in a group. Across 20 real peppered tanks in the AquaGauge dataset (July 2026 snapshot), keepers run a median of 3–4 in a 20-gallon (10 tanks), rising to a median of 7 in the five tanks over 40 gallons — so the typical group is on the small side. Aim for six or more. A 20-gallon is the comfortable minimum; as bottom foragers they need floor space. Plan the mix in the stocking calculator or see the full how many corydoras breakdown.
Water and substrate
Beyond the cool tolerance, peppered corys are forgiving: pH 6.0–7.5 and stable, clean water suit them.2 Use soft sand so they can sift for food without wearing down their barbels. Across our genus-wide corydoras water-parameter data keepers run a median of 78 °F — fine as an upper limit, but a peppered tank can sit several degrees cooler without trouble.
Diet
Peppered corys are omnivorous scavengers, not an algae crew — feed a sinking pellet or wafer as the staple, plus frozen bloodworms, daphnia and brine shrimp.2 They mop up what falls to the bottom but should be fed directly.
Tankmates
Peaceful and indifferent to other fish, peppered corys are excellent community tankmates. Their cool tolerance means they pair well with temperate and standard community fish — small tetras, rasboras, danios, white cloud minnows, shrimp and other corys. Avoid anything large or aggressive enough to bully a bottom-dweller, and very warm-only setups (a discus tank is better suited to sterbai). Check a specific combination in the stocking calculator.
Lifespan and breeding
Peppered corys are long-lived for small fish — keepers commonly report ten years and beyond with good care, one of the longest-lived corys.
They are also the classic beginner’s breeding cory, following the genus pattern: a large, cooler water change triggers spawning, the female deposits sticky eggs on the aquarium glass and fine-leaved plants, and they hatch in about three to four days.2 Once their yolk sacs are absorbed, the fry take microworm and baby brine shrimp over a thin layer of sand.2
Check your exact stocking
Add your fish below to see stocking %, filtration load and compatibility for your setup — live.
Planning a Peppered corydoras tank. We start with your peppered corydoras and filter the list to compatible tankmates — untick to see every species (incompatible ones get flagged).
Stocking — under 85% comfortable · 85–100% full · over 100% overstocked
Show the math
Gear for this setup
As an Amazon Associate AquaGauge earns from qualifying purchases. Some links below are affiliate links, at no extra cost to you. Current price and availability are shown on Amazon. Disclosure.
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Hikari Sinking Wafers (3.88 oz) The staple sinking food for peppered corys; breaks apart slowly so the whole group can graze. Check price on Amazon → -
Aqua Natural Sugar White Sand (10 lb) Smooth, barbel-safe sand so corys can sift naturally without wearing down their barbels. Check price on Amazon → -
AQUANEAT Bio Sponge Filter (up to 20 gal) Gentle flow that won't blast bottom-dwellers off the sand, and safe for fry. Check price on Amazon → -
API Freshwater Master Test Kit Liquid tests for ammonia, nitrite, nitrate and pH — keep a community tank cycled and stable. Check price on Amazon →
FAQ
- Can peppered corydoras live in an unheated tank?
- Often, yes. Peppered corys are subtropical and comfortable from the mid-60s°F up, so they suit a cooler or unheated room-temperature tank better than any other common cory. Avoid sudden swings and very cold rooms.
- What temperature do peppered corydoras need?
- A wide 64-78°F (18-26°C). They come from subtropical southern South America, so they tolerate cooler water than tropical corys and do not need a warm tank.
- How many peppered corydoras should I keep?
- At least six. They are shoaling catfish that forage confidently in a group. Across real tanks, keepers in a 20-gallon stock a median of 3-4 (10 tanks in our dataset), which is on the low side.
- What size tank do peppered corydoras need?
- A 20-gallon is the comfortable minimum for a group of six. Peppered corys reach about 7 cm (2.5 in) and need floor space to forage.
Sources
- Hoplisoma paleatum (Peppered Corydoras), FishBase. View source ↗
- Corydoras paleatus, Seriously Fish. View source ↗
Freshwater aquarist of 8+ years.
