Dicrossus filamentosus

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Dicrossus filamentosus, also called the Checkerboard Cichlid, is a small South American cichlid valued for its distinctive checkerboard pattern and delicate fins. Native to the soft, acidic waters of Colombia, it is best suited to calm aquariums furnished with roots and shaded areas. This fish becomes especially interesting when it feels secure: males develop long fin extensions, while females carefully defend their territory and brood. Successful care depends on stable water conditions, gentle filtration and a varied diet made up of small foods. Wild specimens benefit from slow acclimation and a quiet, well-structured environment.

General species description

Dicrossus filamentosus is a small South American dwarf cichlid, generally peaceful except during breeding. Its elongated body displays dark markings arranged in crossing rows, producing the characteristic checkerboard design behind its common name. It mainly inhabits calm, shaded areas filled with vegetation or submerged wood. In an aquarium, it appreciates a layout with many visual barriers and low shelters. The species is usually discreet, but territorial behaviour becomes more pronounced around a spawning site. It is fairly common in the specialist trade, although it is more demanding than a hardy community cichlid and responds poorly to unstable water or aggressive tankmates.

Geographical origin and biotope

This species is associated with the soft waters of Colombia, including the Rio Choco basin indicated for this strain. Its natural environment consists of forest streams and small tributaries with slow flow, often stained by tannins released from decaying plant material. The water is generally warm, very low in mineral content and acidic. The bottom contains fine sand, dead leaves, small branches and submerged roots. In the aquarium, moderately remineralized reverse-osmosis water, subdued lighting and dried leaves can reproduce the main features of this biotope. Excessive water movement should be avoided because the fish naturally uses quiet, sheltered areas.

Precise location and local name

The geographical reference provided for this population is the Rio Choco in Colombia, within an environment of small forest tributaries. The most common aquarium name is Checkerboard Cichlid; the French trade name is cichlidé damier. As with several small South American cichlids, practical identification relies on the colour pattern, fin shape and stated origin. To preserve the characteristics of a strain, fish from different localities should preferably be kept separate and mixed origins avoided when traceability matters. A quiet aquarium with leaf litter and roots helps reveal the species’ natural behaviour.

Appearance and physical characteristics

Dicrossus filamentosus has a relatively low, elongated body with a grey-beige to pale brown base colour. Dark markings form a highly recognizable checkerboard network. The fins may show reddish or orange tones, especially in males in breeding condition. Adult males are often distinguished by filamentous rays on the dorsal and caudal fins, which are more developed than in females. Females are usually smaller and more compact. Colour changes with mood, surroundings, social rank and water quality; a stressed fish often becomes duller and loses contrast. Strong contrast and extended fin rays are usually signs of good condition.

General diet

Dicrossus filamentosus mainly feeds on small prey and organisms collected from the substrate or among fallen leaves. It accepts frozen foods such as mosquito larvae, daphnia and brine shrimp, as well as small prepared foods. A diet that regularly includes live or frozen foods supports good condition and natural behaviour. Fine sinking pellets can supplement the diet, but they should be offered in small portions. It is better to feed lightly and frequently while removing leftovers. Juveniles and breeding females benefit especially from a varied diet rich in small prey. Avoid relying exclusively on dry food, particularly during acclimation.

Essential data

• Native river: Rio Choco
• Local name: Checkerboard Cichlid
• Origin of the scientific name: Genus name Dicrossus and specific epithet filamentosus.
• Etymology of the full name: Dicrossus suggests a double fringe or double structure; filamentosus means filamentous, referring to the fin extensions.
• Common or vernacular names: Checkerboard Cichlid; cichlidé damier.
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: di kross us fil am en TOH sus
• Discovery: Werner Ladiges, 1958.
• Maximum adult size: About 8 cm.
• Water temperature and pH: 24 to 29 °C; pH 4.5 to 6.5.
• Stream appearance and surrounding vegetation: Shaded forest streams with amber water, leaf litter, roots and dense vegetation.
• Typical tankmates: Paracheirodon axelrodi, Nannostomus eques, Hemigrammus rhodostomus, Otocinclus affinis.
• Temperament and behaviour: Peaceful, discreet and territorial around a brood.
• Water depth: Shallow, calm areas of small tributaries.
• Sexual dimorphism: Male larger and more slender, often with longer filamentous rays; female smaller and stockier.
• Bottom and flow: Fine sand, leaves, roots and wood; slow to moderate flow.

In your aquarium, success depends on warm, soft and acidic water, a shelter-rich layout and moderate flow. Since this species is wild collected, this strain is offered as wild specimens: patient acclimation and stimulating foods are especially important. Maintain excellent water quality, avoid boisterous tankmates and provide several shelters to reduce tension between individuals. Stable conditions matter more than visual decoration alone.