The Black Marble Hoplo is a hardy, active armored catfish from South America. Known for its generally peaceful nature and adaptability, it's an excellent scavenger. Uniquely among catfish, they can breathe atmospheric air from the surface and males are bubble-nesters.
Black Marble Hoplo At a Glance
Black Marble Hoplo Tank Requirements
Will Black Marble Hoplo fit in your tank?
Care guides tell you what Black Marble Hoplo needs, the next question is whether your tank can safely provide it. Test Black Marble Hoplo against your tank size, maintenance needs, and the fish you already keep before you buy.
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Black Marble Hoplo Water Parameters
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Black Marble Hoplo Temperament & Compatibility
Black Marble Hoplo Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard / Unsexed
The standard commercially available Hoplo. Mostly peaceful, highly active bottom dwellers that do best in small shoals. While they won't bother medium/large fish, they will cheerfully consume dwarf shrimp or tiny fry.
Same care requirements as the base species
Also known as: Juvenile
Male
Males develop distinctly thickened, often reddish pectoral fin spines. When breeding, males construct bubble nests at the water's surface and become fiercely territorial, sometimes even jumping to bite the keeper's hand to defend the nest.
Differs in 2 traits from base species
Also known as: Breeding Male
Female
Females are slightly rounder and lack the thickened pectoral spines of the male. They remain completely peaceful even during the breeding season.
Differs in 1 trait from base species
Albino Morph
A very popular, selectively bred color morph featuring a pale pinkish-white body with light brown spots. Behavior and care requirements are identical to the standard wild-type.
Same care requirements as the base species
Also known as: Albino Hoplo, Albino Spotted Hoplo
Black Marble Hoplo Care Guide Summary
The Black Marble Hoplo, scientifically known as Megalechis thoracata, belongs to the Catfish family group. Adults reach a maximum size of approximately 15 cm and have a depressed body shape with a fast growth rate. Classified as mostly peaceful, this species primarily occupies the bottom and mid-level zones of the aquarium and produces a medium level of biological waste.
To thrive, the Black Marble Hoplo requires a freshwater only aquarium with a minimum volume of 115 litres and a tank length of at least 90 cm. Water temperature should be maintained between 18°C and 28°C, with a pH range of 6–8 and a general hardness of 2–20 dGH. A low water flow is preferred.
The Black Marble Hoplo is a rewarding species to keep, provided its core environmental needs are met. This species is available in 4 varieties: Standard / Unsexed, Male, Female, and Albino Morph. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Black Marble Hoplo Habitat Setup
When setting up an aquarium for the Black Marble Hoplo, a low water flow best suits their natural preferences. Because this species occupies the bottom and mid-level zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour and smooth gravel or rounded substrate to protect their sensitive barbels. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper and expect substrate disturbance, so lightweight décor should be secured.
Black Marble Hoplo Compatibility Notes
Classified as mostly peaceful, the Black Marble Hoplo is a social species that requires the company of its own kind to thrive. When choosing tankmates, ornamental shrimp are not safe companions and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the bottom and mid-level zones can help reduce competition and territorial overlap.
Black Marble Hoplo Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Black Marble Hoplo.
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
Show 9 more tank sizes
Black Marble Hoplo Feeding & Diet Considerations
The Black Marble Hoplo will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups and will eat fry, so breeding efforts in the same tank are unlikely to succeed.
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Frequently Asked Questions About Black Marble Hoplo
How big does Black Marble Hoplo get?
Black Marble Hoplo (Megalechis thoracata) typically reaches a maximum adult size of approximately 15 cm. They have a depressed body shape and a fast growth rate.
What tank size does Black Marble Hoplo need?
A minimum aquarium volume of 115 litres and a tank length of at least 90 cm are recommended for Black Marble Hoplo. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Black Marble Hoplo need?
Black Marble Hoplo thrives in freshwater only conditions with a temperature range of 18–28°C, a pH between 6 and 8, and a general hardness of 2–20 dGH. A low water flow is preferred.
Is Black Marble Hoplo peaceful or aggressive?
Black Marble Hoplo is classified as mostly peaceful with an aggression score of 3 out of 10. They are generally well-suited to peaceful community tanks.
Can Black Marble Hoplo live alone?
No, Black Marble Hoplo should be kept in groups of at least 3 to reduce stress and encourage natural behaviour.
Is Black Marble Hoplo safe with shrimp?
No. Black Marble Hoplo is known to eat ornamental shrimp and is not recommended for shrimp tanks. Even larger shrimp species like Amano Shrimp may be at risk.
Does Black Marble Hoplo have any special tank requirements?
Yes. Black Marble Hoplo benefits from sand (sifters) and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Black Marble Hoplo need a lid on the tank?
Yes. Black Marble Hoplo is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Top Tank Mates for Black Marble Hoplo
These fish are strong compatibility matches for Black Marble Hoplo based on water preferences, temperament, adult size, and tank behavior.
Celebes Halfbeak
Nomorhamphus liemi
Ideal Tank MatesWrestling Halfbeak
Dermogenys pusilla
Ideal Tank MatesParkinson's Rainbowfish
Melanotaenia parkinsoni
Ideal Tank MatesOgilby's Rainbowfish
Melanotaenia ogilbyi
Ideal Tank MatesPearl Danio
Danio albolineatus
Ideal Tank MatesPanda Tetra
Aphyocharax paraguayensis
Ideal Tank MatesPlants That Suit Black Marble Hoplo
These plants pair well with Black Marble Hoplo based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Amazon Frogbit
Limnobium laevigatum
Asian Watergrass
Hygroryza aristata
Asian Watermoss
Salvinia cucullata
Carolina Mosquito Fern
Azolla caroliniana
Common Duckweed
Lemna minor
Crystalwort
Riccia fluitans
Fish Similar to Black Marble Hoplo
Brown Hoplo Catfish
Hoplosternum littorale
A heavily armored, highly adaptable catfish native to South America. It possesses the unique ability to breathe atmospheric air using a modified intestine, allowing it to survive in oxygen-depleted swamps. They are peaceful but boisterous bottom-dwellers with voracious appetites. They constantly forage, which can result in the uprooting of delicate plants.
Striped Raphael Catfish
Platydoras armatulus
A highly robust, armored catfish native to the Amazon and Orinoco basins. Famous for their ability to produce audible squeaking or grunting sounds when distressed or defending territory. They are nocturnal scavengers that spend most of the day hiding in driftwood or caves. Note: Their rigid pectoral spines can easily become tangled in standard aquarium nets.
Pictus Catfish
Pimelodus pictus
An extremely active, striking silver catfish with black spots and incredibly long barbels, native to South America. While peaceful toward similarly sized tank mates, they are highly effective nocturnal predators that will easily swallow small fish (like Neon Tetras) whole. They are scaleless and possess sharp pectoral spines that can easily become entangled in aquarium nets.
Harlequin Rasbora
Trigonostigma heteromorpha
A highly popular, peaceful schooling fish recognizable by its metallic copper/orange body and the distinct black triangular 'porkchop' patch on its hindquarters. Originating from peat swamps and blackwater streams in Southeast Asia, they are active swimmers that thrive in heavily planted aquariums with gentle to moderate water flow.
Adolfo Cory
Corydoras adolfoi
Adolfo's Corydoras is a highly sought-after, peaceful schooling catfish native to the blackwater habitats of the Rio Negro basin. They are easily identified by their bright orange nape and distinct black eye stripe. Like all corydoras, they require soft sand substrate to protect their delicate sensory barbels as they constantly sift the bottom for food.
Siamese Algae Eater
Crossocheilus oblongus
Famous for being one of the few freshwater fish that actively consumes Black Beard Algae (BBA). A torpedo-shaped, active bottom-to-midwater swimmer native to Southeast Asian streams. True Siamese Algae Eaters feature a distinct black horizontal stripe that extends all the way through the tail fin. As they mature, they can become lazy, preferring prepared foods over algae, and may occasionally chase other bottom dwellers.