Striped Headstander

Geographic Origin and Biotope: Widespread in the central Amazon and Orinoco (Brazil, Peru, Venezuela). Gathers among the dense vegetated banks of fast-flowing rivers, often in small schools among logs and rocky crevices in highly oxygenated waters.

Taxonomy and Morphology: Striped Headstander (Anostomus anostomus). The family name (Anostomidae) indicates the curiously upturned mouth. Tapered "torpedo" profile. Its most famous characteristic is its swimming and resting posture: inclined at 45 degrees with its head pointing towards the bottom.

Social Behavior: Extremely gregarious but establishes rigid hierarchies with continuous displays and "shoves". Becomes a serial fin nipper if kept alone or in insufficient numbers. Schools (minimum 6-8 specimens) disperse intra-specific aggressiveness.

Coloration and Sexual Dimorphism: Alternating pale/golden yellow and deep brown-black longitudinal stripes cover the entire body like a horizontal "barcode". Base of the fins mottled with intense rust red. Dimorphism almost non-existent (mature females slightly stockier).

Aquarium Setup: An aquarium (120 cm / 48 inches minimum for a school) hermetically closed: they are peerless jumpers. Strong currents. The use of rocks with cultivated green algae ("Aufwuchs") provided vertically will satisfy their instinct to graze upside down.

Diet and Feeding: Omnivore with a very strong plant requirement. In nature they eat thread-like and epiphytic algae tearing them violently, ingesting microfauna. Feed with spirulina wafers, zucchini, bloodworms and Brine shrimp. Will relentlessly devour soft-leaved aquarium plants.

Water Quality: Requires clear and highly oxygenated waters. Temperature fluctuations or too high nitrates make them subject to intestinal blockages and parasitosis. Weakly acidic or neutral PH.

Compatibility and Tankmates: Perfect partners for rheophilic Loricariids (Plecos), large peaceful or semi-aggressive Cichlids (Severums, Geophagus) and large Characins. The golden rule: never pair them with slow fish or those with long flowing fins (Angelfish, Bettas) which would be amputated.

Aquarium Reproduction: Very rare in captivity. Egg scatterers. In rare cases of fortuitous reproduction, they scatter the tiny eggs among the dense vegetation (mosses) completely abandoning any parental care. The eggs are greedy for oxygen.

Risks and Diseases: Zero tolerance for "tank dwarfism": if the tank is too short they will not develop the schooling aptitude and will go crazy with panic, darting against the glass. Very high risk of jumping from the lid.