Caring for Pangasius catfish (commonly referred to as iridescent sharks) requires a well-maintained aquarium environment and a commitment to meeting their needs. Here’s a guide on how to properly care for them:
 
1. Tank Requirements
 
    •    Tank Size: Pangasius catfish grow large, often reaching 3–4 feet in captivity. A minimum tank size of 300–500 gallons is recommended for adult fish.
    •    Shape: A long tank with ample swimming space is ideal, as they are active swimmers.
    •    Lid: Ensure the tank has a secure lid; these fish are known to jump.
 
2. Water Conditions
 
    •    Temperature: Maintain a range of 22–28°C (72–82°F).
    •    pH: A neutral to slightly alkaline pH of 6.5–7.5 is best.
    •    Hardness: Soft to moderate water, around 2–15 dGH.
    •    Filtration: Use a powerful filtration system; Pangasius produce a lot of waste.
    •    Water Flow: Moderate water flow mimics their natural river habitat.
    •    Water Changes: Perform regular water changes (20–30% weekly) to maintain water quality.
 
3. Feeding
 
    •    Diet: They are omnivorous and will eat:
    •    Commercial sinking pellets.
    •    Live or frozen foods like bloodworms, brine shrimp, or krill.
    •    Vegetables like peas or zucchini (blanched).
    •    Frequency: Feed them 1–2 times a day, providing only as much as they can consume within 5 minutes.
 
4. Tankmates
 
    •    Compatibility: Choose peaceful tankmates of similar size. Suitable tankmates include:
    •    Large plecos.
    •    Bala sharks.
    •    Other large, peaceful fish.
    •    Avoid: Small fish, as they may be seen as food.
 
5. Behavior and Handling
 
    •    Schooling Fish: They are social and prefer to be in groups of at least 3–5. However, this requires even more space.
    •    Stress Sensitivity: Pangasius catfish are easily stressed by sudden movements or loud noises.
    •    Handling: Avoid handling them directly, as they are sensitive and may injure themselves.
 
6. Health Concerns
 
    •    Common Issues: Look out for stress-related illnesses, ich, and bacterial infections.
    •    Prevention: Maintain excellent water quality, avoid overcrowding, and ensure a varied diet.
 
7. Long-Term Care
 
    •    Growth Potential: Be prepared for their significant size and fast growth.
    •    Commitment: They can live for over 10 years with proper care.
 
Providing the right environment and care for Pangasius catfish ensures they thrive in captivity. Their size and active nature make them a challenging but rewarding addition to large aquariums.