The Angelfish (Pterophyllum scalare) is the undisputed monarch of the South American community tank, a tall, elegant cichlid whose flowing fins and intelligent gaze have made it a favorite for decades. Despite its peaceful reputation, the angelfish is a true cichlid with a predatory streak and a strong instinct to pair and defend a territory. Native to the slow, plant-choked tributaries of the Amazon basin, these fish grow large, live long, and reward keepers who respect both their grace and their temperament. This guide explains the water parameters, territorial pairing, and diet that keep angelfish healthy and harmonious.
1. Natural Habitat and Water Parameters
Angelfish inhabit flooded forests and slow rivers where roots, branches, and vertical plant cover create a maze of territories.
- Temperature Range: Maintain 24°C to 28°C (75°F to 82°F). Warmer water supports immunity but demands higher oxygen levels.
- pH and Hardness: They accept 6.0 to 7.5 pH and soft to moderately hard water, though wild-caught specimens demand softer, more acidic conditions.
- Water Quality: Angelfish produce a heavy bioload and are intolerant of nitrate. Large, frequent water changes are essential as they grow.
2. Tank Setup and Aquascaping
Because angelfish grow tall rather than long, tank height and swim space matter as much as footprint.
- Minimum Tank Volume: A single pair needs at least 120 liters (30 gallons); a group requires a considerably larger, taller tank.
- Decor: Tall driftwood, vertical rocks, and broad-leaved plants echo their native biotope and provide spawning sites.
- Filtration and Flow: Use robust filtration with gentle flow. Avoid strong currents that buffet their large fins.
3. Diet and Feeding Regimen
Angelfish are opportunistic omnivores and micropredators that need substantial protein for growth and fin development.
- Staple Foods: High-quality cichlid pellets or granules form the base of the diet.
- Live and Frozen Foods: Bloodworms, brine shrimp, and blackworms are eagerly accepted and support spawning condition.
- Feeding Frequency: Feed two to three times daily while young to support rapid growth, reducing to once or twice daily for adults.
4. Temperament, Pairing, and Tank Mates
Angelfish are peaceful toward fish they cannot swallow yet territorial when they pair and spawn.
- Pairing: Angelfish form strong monogamous pairs. Expect aggression toward other angelfish once a pair establishes a territory.
- Ideal Tank Mates: Mid-sized, peaceful fish that are too large to be eaten, such as larger tetras, Corydoras, and peaceful catfish.
- Tank Mate Warnings: Do not house angelfish with neon tetras or other small fish, which they instinctively eat as they grow.
5. Breeding and Fry Rearing
Angelfish are substrate spawners that lay eggs on flat surfaces such as slate, broad leaves, or spawning cones.
- Spawning: A bonded pair cleans a site and lays hundreds of eggs, which both parents fan and guard.
- Egg Care: Remove other fish if the pair becomes aggressive, or leave the pair to parent the eggs in a dedicated tank.
- Fry Rearing: Feed free-swimming fry baby brine shrimp and microworms. Growth is rapid with abundant food and clean water.
6. Common Health Issues and Prevention
Angelfish are hardy but susceptible to several diseases that exploit stressed or crowded conditions.
- Ich and Velvet: New arrivals without quarantine frequently introduce these parasites. Always quarantine for two to three weeks.
- Hole-in-the-Head: Associated with poor water quality and mineral deficiency. Maintain pristine water and a varied diet.
- Internal Parasites: Wild-caught and farm-bred fish may carry intestinal worms. Deworm during quarantine as a precaution.
7. Long-Term Maintenance and Lifespan
Given room and excellent care, angelfish live ten years or more and can reach impressive size.
- Weekly Routine: Change 30 to 50 percent of the water to control nitrate and support growth.
- Monthly Tasks: Inspect equipment, clean filter media, and watch paired fish for escalating aggression.
- Observation: Track fin integrity, appetite, and territory disputes as early signals of trouble.
