Schwartz´s catfish (Hoplisoma schwartzi) — XL

Overview

Freshwater fish UK aquarists seeking a peaceful, active bottom-dweller will find Hoplisoma schwartzi, commonly known as Schwartz's catfish or Schwartzi cory, an excellent choice for community aquariums. This small armored catfish originates from the Purus River basin in Brazil, where it inhabits slow-moving waters with sandy substrates. Available for sale UK in XL sizes, the species reaches approximately 3.9cm at maturity, making it one of the smaller Corydoras-type catfish suitable for medium-sized aquariums. Peaceful temperament, constant activity, and hardiness appeal to aquarists with some experience maintaining South American community fish. Moderate care requirements suit those committed to proper substrate, water quality, and group housing.

Appearance

Hoplisoma schwartzi features a compact, armored body typical of Corydoras-type catfish, with attractive patterning consisting of dark horizontal stripes or mottling against a cream or pale tan base coloration. The pattern varies between individuals, with some showing bold defined lines while others display more subtle markings. The head is small and rounded, with downturned mouth surrounded by sensitive barbels used for foraging. The body is covered in overlapping bony plates providing protection from predators. All fins are rounded and semi-transparent, with the dorsal fin featuring a prominent hard spine. Males remain slightly smaller and more streamlined than females, who develop rounder, fuller bodies when mature. Overall appearance is attractive and characteristic of South American armored catfish.

Natural Habitat

This species inhabits the Purus River basin in Brazil, occupying slow-moving tributaries, floodplain areas, and shallow streams with sandy or muddy substrates. Water conditions are typically warm, soft, slightly acidic to neutral, and moderately stained with tannins from decaying organic matter. Natural habitats feature submerged wood, leaf litter, aquatic vegetation, and sandy substrates where the catfish forage in groups for insect larvae, small invertebrates, and organic detritus. Seasonal flooding disperses populations into temporarily inundated areas, while the dry season concentrates fish in deeper channels and pools. The species coexists with other peaceful South American community fish in densely vegetated, dimly lit waters.

Aquarium Setup

A minimum 60-litre aquarium with dimensions emphasizing length provides suitable space for a group of 6-8 Schwartz's catfish. Use soft, fine sand substrate to protect the delicate barbels, which the catfish use constantly for foraging. Avoid sharp gravel or coarse substrates that damage barbels and lead to infections. Provide driftwood, smooth rocks, dried leaves, and dense planting with species such as Java fern, Anubias, and Cryptocoryne to create hiding places and subdued lighting. Moderate filtration maintains water quality without creating strong currents—the species prefers calm water. Ensure excellent water quality, as Corydoras-type catfish are sensitive to elevated ammonia, nitrite, and nitrates. Floating plants help diffuse lighting and create security.

Water Parameters

Maintain temperatures between 22-26°C, with 23-25°C representing optimal conditions. The species tolerates slight variations but requires stability. pH can range from 6.0-8.0, with slightly acidic to neutral values (6.5-7.0) ideal. Water hardness can vary from soft to moderately hard, though soft to moderate hardness better replicates natural Amazonian conditions. Ammonia and nitrite must be undetectable, while nitrates should stay below 30 ppm through efficient biological filtration and weekly water changes of 25-30%. Corydoras-type catfish are particularly sensitive to poor water quality, responding with barbel erosion, lethargy, or increased susceptibility to disease. Maintain consistency and perform regular maintenance to ensure long-term health.

Feeding

Hoplisoma schwartzi is an omnivore with a preference for meaty foods. Offer quality sinking corydoras pellets or wafers as the dietary foundation, supplemented with frozen or live foods such as bloodworms, blackworms, brine shrimp, daphnia, and other small invertebrates. Feed once daily in the evening to align with the species' crepuscular activity pattern, though aquarium specimens adapt to daytime feeding. Ensure food reaches the substrate where the catfish forage—the species rarely ventures to the surface. A varied diet supports healthy growth, vibrant coloration, and breeding condition. Monitor feeding closely to ensure the catfish receive adequate food and are not outcompeted by faster-swimming tankmates.

Behaviour

Schwartz's catfish are peaceful, social fish that form cohesive groups constantly foraging across the substrate. Activity remains moderate to high throughout the day, with increased feeding activity during dawn, dusk, and evening hours. The group moves together, probing sand and gravel with sensitive barbels in search of food particles. The catfish occasionally dash to the surface to gulp atmospheric air—a natural behavior allowing them to supplement dissolved oxygen. The species displays no aggression toward tankmates and is entirely compatible with other peaceful community fish. Stress or inadequate group size causes the fish to hide frequently, while confident groups remain visible and active throughout the day.

Tank Mates

Hoplisoma schwartzi thrives alongside small, peaceful community fish that share similar water requirements. Suitable companions include small tetras (ember, neon, cardinal), rasboras, dwarf cichlids (Apistogramma, Mikrogeophagus), peaceful barbs, small livebearers, and other peaceful bottom dwellers. Avoid large or aggressive fish, predatory species, fin-nippers, or very boisterous tankmates that intimidate or harass the catfish. The species' peaceful nature, small size, and constant substrate activity make it an ideal addition to well-planned South American community tanks.

Breeding

Breeding Hoplisoma schwartzi in aquarium conditions is possible with a well-conditioned group, excellent water quality, and appropriate setup. Trigger spawning through cooler water changes, increased feeding with protein-rich live or frozen foods, and seasonal environmental cues. Provide fine-leaved plants, spawning mops, or smooth surfaces for egg deposition. Females deposit adhesive eggs on plants, glass, or decorations, after which adults should be removed to prevent egg predation. Eggs hatch in 3-5 days, and fry require microscopic foods such as infusoria initially, transitioning to newly hatched brine shrimp within a week. Raising fry demands exceptional water quality and frequent small feedings. Breeding success depends on stable water chemistry, well-conditioned adults, and low stress.

Why Buy from Tropical Fish Co

Tropical Fish Co supplies healthy, active Schwartz's catfish carefully selected for good body condition and strong schooling behavior. We ensure all specimens are feeding confidently on prepared foods and displaying normal social behavior before dispatch. Our expert team provides detailed care guidance covering the importance of group housing, soft sand substrate, water parameters, and suitable tankmate selection. With reliable UK delivery using specialist livestock couriers, your catfish arrive safely in insulated packaging with oxygen. We support responsible fishkeeping and offer ongoing advice to help you succeed with this peaceful, engaging species. Choose Tropical Fish Co for quality South American catfish and expert customer support.