Cupid Cichlid

Biotodoma cupido is native to the Amazon River basin, Orinoco drainage, and Guiana Shield rivers, inhabiting slow-moving, sandy-bottomed tributaries and floodplain lakes with soft, warm, slightly acidic to neutral water. It is one of the smaller eartheater cichlids, reaching only 12 cm, and is often considered one of the most beautifully patterned members of the subfamily.

The Cupid Cichlid has a moderately elongated body with an elegantly pointed snout. The coloration includes a pale base of greenish-cream to gold, with iridescent green horizontal streaking on the cheeks and operculum. A prominent, sharply defined ocellus (eyespot) is present on the mid-flank. The dorsal and caudal fins of mature males may show orange-red edging and elongated fin extensions.

In the aquarium, Biotodoma cupido is a gentle, substrate-sifting cichlid that spends much of its time at the bottom of the tank, methodically sampling the sand for food. It is peaceful even toward very small fish and can be kept in community aquariums with tetras, small rasboras, and other delicate species that share its soft-water requirements.

The Cupid Cichlid is considered intermediate in difficulty primarily because of its water quality sensitivity and need for very soft, acidic water. Given the correct conditions, however, it is a hardy and adaptable species that can be bred in the aquarium.

Tank Setup A minimum 120-liter tank is suitable for a pair or small group. Provide at least 5–7 cm of fine white or river sand — this is non-negotiable for the fish's natural behavior and wellbeing. Use driftwood, smooth stones, and a few robust plants like Anubias or Java fern for structure. Indian almond leaves and a dim, natural lighting scheme recreate blackwater conditions. Gentle, low-flow filtration is preferred.

Water Parameters Maintain temperature 24–28°C, pH 5.5–7.0, GH 1–8, KH 1–4. Very soft, warm, slightly acidic water is strongly preferred. Use RO water or peat-filtered water if tap water is hard. Nitrate levels should be kept below 15 ppm; perform 25% water changes twice weekly. High water quality is critical for long-term health and breeding.

Feeding Omnivorous; feed fine sinking foods including small eartheater pellets, frozen bloodworms, daphnia, baby brine shrimp, and finely minced krill. Scatter food on the sand surface to encourage sifting. Avoid very large pellets that cannot be sifted. Feed twice daily in small portions.

Tankmates Very peaceful; suitable tankmates include small to medium tetras, pencilfish, dwarf corydoras, small rasboras, and other peaceful soft-water species. Avoid boisterous or aggressive species. Can be kept in small groups of 4–6 Cupid Cichlids, which reduces stress and encourages natural behavior.

Breeding Substrate spawner; the pair cleans a flat stone or sand depression for egg deposition. Both parents guard eggs and wriggling fry. Eggs hatch in 2–3 days; fry become free-swimming after 5–7 days. Raise on freshly hatched brine shrimp and ultra-fine powder food.