F1 Atabapo Altum Angelfish Hi Fin 3-4 cm body

F1 Atabapo Altum Angelfish are first-generation offspring bred from wild-caught Altum Angelfish originating from the Rio Atabapo region. Known as the “true Altum,” this species is highly prized for its tall, laterally compressed body, elongated fins, and elegant vertical striping. Juveniles at 3–4 cm already show the classic Altum shape, and with proper care, they develop into majestic centerpiece fish. Compared to standard angelfish, Altums are more sensitive but far more impressive in appearance and presence.

F1 Atabapo Altum Angelfish (3–4 cm) – Complete Care Guide Description F1 Atabapo Altum Angelfish are first-generation offspring bred from wild-caught Altum Angelfish originating from the Rio Atabapo region. Known as the “true Altum,” this species is highly prized for its tall, laterally compressed body, elongated fins, and elegant vertical striping. Juveniles at 3–4 cm already show the classic Altum shape, and with proper care, they develop into majestic centerpiece fish. Compared to standard angelfish, Altums are more sensitive but far more impressive in appearance and presence. Water Parameters Altum Angelfish require pristine, soft, and acidic water conditions: Temperature: 28–30°C (82–86°F) pH: 4.5–6.5 Hardness: 0–5 dGH Tank Size: Minimum 200 liters (55 gallons) for juveniles; larger for adults Water Flow: Gentle Water Changes: 20–30% frequent (2–3 times weekly preferred) Care & Maintenance Altums are delicate and demand consistent, high-quality care: Maintain ultra-clean, stable water conditions—they are highly sensitive to fluctuations. Use a tall aquarium, as they grow vertically. Provide driftwood, roots, and plants to mimic their natural blackwater habitat. Add leaf litter (Indian almond leaves) to create tannin-rich water. Use soft lighting and subdued environments to reduce stress. Feed a high-quality varied diet: live/frozen foods (brine shrimp, bloodworms) and premium pellets. Quarantine new fish carefully—Altums are prone to stress-related diseases. Behaviour & Temperament Peaceful but can become territorial as they mature, especially during breeding. Shy and sensitive when young—require calm surroundings. Prefer to be kept in groups of 5–6 or more for confidence. Graceful swimmers occupying mid to upper levels. Intelligent and observant, often interacting with their environment. Compatibility Best suited for peaceful, soft-water community tanks. Compatible with calm, non-aggressive species that tolerate similar water conditions. Avoid mixing with aggressive or highly active fish. Ideal for Amazon/blackwater biotope setups. Suitable Tank Mates Cardinal Tetras Rummy Nose Tetras Pencilfish Corydoras (soft water species) Discus (with experienced care and matching conditions) Peaceful dwarf cichlids (Apistogramma) Tank Mates to Avoid Aggressive cichlids Fin-nipping fish (e.g., tiger barbs) Very small fish (may be eaten as they grow) Fast, boisterous species that stress them Fish that prefer hard or alkaline water Pro Tips Acclimate slowly and carefully—Altums are sensitive to sudden changes. Maintain low nitrate levels (ideally below 10 ppm). Use RO water mixed with minerals to achieve ideal softness and pH. Keep in groups during juvenile stage for better growth and confidence. Ensure excellent filtration without strong current. A tall tank (at least 20–24 inches height) is essential for proper development. Avoid overcrowding—space and water quality are key to success. Summary F1 Atabapo Altum Angelfish are among the most elegant and sought-after freshwater species, perfect for advanced aquarists. With pristine water conditions, a calm environment, and proper care, they grow into breathtaking centerpiece fish that elevate any high-end aquarium setup.