Adolfo’s Cory: In-Depth Care Profile
Stunning blackwater catfish from the Upper Rio Negro with a vivid orange shoulder patch and sharp black mask. Peaceful, social, and ideal for soft-water community aquariums.
Description
Overview
Adolfo’s Cory (Corydoras adolfoi, recently reclassified as Hoplisoma adolfoi) is a strikingly handsome blackwater catfish endemic to the Upper Rio Negro in Brazil. With its bright orange shoulder patch, sharp black eye-mask, and silvery body, it ranks among the most beautiful and sought-after small Corydoras species. Like all cories, it’s a social, peaceful bottom-dweller that earns its keep tidying up leftover food while bringing personality and movement to the lower levels of the community aquarium.
Natural Habitat
Adolfo’s Cory is endemic to blackwater tributaries of the Upper Rio Negro in Amazonas state, Brazil. Its native waters are exceptionally soft and acidic, deeply stained with tannins from decomposing leaf litter and submerged wood. Substrates are typically fine white sand interspersed with leaf litter, branches, and tree roots, and the species is most often found in shallow, slow-moving margins beneath dense rainforest canopy where light penetration is minimal.
Tank Setup
A 20-gallon (~75 L) aquarium is the recommended minimum for a small group. Use a fine sand substrate — coarse or sharp gravel can damage their delicate barbels and lead to infections. Provide shaded areas with driftwood, twisted roots, smooth river stones, and dried Indian almond or oak leaves to replicate blackwater conditions and encourage natural behavior. Hardy, low-light plants such as Anubias, Microsorum, and Cryptocoryne are ideal. Gentle to moderate filtration with good oxygenation is essential; cories are intolerant of stagnant or low-oxygen water.
Diet
Adolfo’s Cory is a foraging omnivore. In nature they sift sandy substrate for small worms, insect larvae, crustaceans, and detritus. In the aquarium offer a varied diet of high-quality sinking pellets or wafers, supplemented several times per week with frozen or live bloodworm, tubifex, daphnia, and baby brine shrimp. Despite the persistent myth, cories should never be relied on as “cleaners” — they require their own dedicated food and will starve in tanks with insufficient sinking food.
Water Parameters
Temperature: 72–79 °F (22–26 °C). pH: 6.0–7.0. GH: 2–12 dGH (soft to moderately soft). KH: 0–6 dKH. Adolfo’s Cory thrives in soft, slightly acidic water that mirrors its native blackwater habitat. While they tolerate a moderate range, stability is critical. Weekly water changes of 25–30% with dechlorinated water at matched temperature help maintain water quality and trigger natural behaviors.
Temperament & Tankmates
Peaceful, gregarious, and social, Adolfo’s Cory should be kept in groups of at least 6 individuals — larger groups are even better and produce far more confident, natural behavior. Ideal tankmates are other small, peaceful blackwater community species: small tetras (Neon, Cardinal, Ember, Rummynose), Hatchetfish, Pencilfish, Otocinclus, dwarf rasboras, and peaceful dwarf cichlids such as Apistogramma. Avoid aggressive, boisterous, or large predatory tankmates as well as sharp gravel and competitive bottom-feeders that may outcompete them for food.
Breeding
Adolfo’s Cory can be bred in the aquarium with attention to detail. Condition a small group heavily on live and frozen foods in cool, soft, acidic water, then trigger spawning with a large (50–70%) cool water change that drops temperature by several degrees, simulating the seasonal rainfall of their native habitat. Females deposit eggs on plant leaves, glass, and decor, often in the classic “T-position” embrace with males. Eggs hatch in 3–5 days; fry are sensitive to water quality and benefit from frequent small water changes and microworms or baby brine shrimp as starter foods.
Health & Acclimation
Adolfo’s Cory is generally hardy when sourced from quality stock and kept in stable, well-oxygenated water. They are sensitive to old, nitrate-heavy water and to copper-based medications, which should be avoided or used at reduced dose. Always quarantine new arrivals for 2–4 weeks before adding to your display tank, and acclimate slowly via the drip method over 45–60 minutes. See our Shipping & Acclimation guide for our recommended procedure.
Approximate Shipping Size
Adolfo’s Cories ship at approximately 0.75–1 inch (2–2.5 cm) body length. Adult size is approximately 2–2.4 inch (50–60 mm). All orders are covered by our Live Arrival Guarantee.
Technical Data
| Field | Value |
|---|---|
| Scientific Name | Corydoras adolfoi (Hoplisoma adolfoi) |
| Common Name | Adolfo’s Cory |
| Family | Callichthyidae |
| Origin | Upper Rio Negro, Brazil |
| Captive Bred or Wild | Captive Bred |
| Care Level | Easy–Moderate |
| Adult Max Size | 2–2.4 in (50–60 mm) |
| Minimum Tank Size | 20 gallons (~75 L) |
| Lifespan | 5–8 years |
| Temperament | Peaceful, gregarious |
| Color | Silver body with orange shoulder patch and black mask |
| Diet | Omnivore (foraging) |
| pH | 6.0–7.0 |
| Temperature | 72–79 °F (22–26 °C) |
| GH | 2–12 dGH |
| KH | 0–6 dKH |
| Group Size | 6+ recommended |
