Can Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) Live Together?
Keeping Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) together is possible but requires caution due to differing aggression levels. Provide a spacious tank of at least 15000 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark)?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
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Behaviour & Temperament
Alligator Pleco is a generally mild-mannered species (3/10), while Chao Phraya Giant Catfish (Paroon Shark) is semi-aggressive (8/10). This notable difference means Chao Phraya Giant Catfish (Paroon Shark) may occasionally assert dominance over Alligator Pleco.
Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) both frequent the Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Worth noting: Alligator Pleco is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Chao Phraya Giant Catfish (Paroon Shark) is a known jumper, so a tight-fitting lid is essential.
To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.
Water Parameters
The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 4–15 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) together, plan for an aquarium of at least 15000 litres with a minimum length of 600 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Driftwood (Digestion/Hiding), Established Algae (Otocinclus), Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.
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Frequently Asked Questions
Can Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 15000 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) need?
A minimum of 15000 litres (tank length at least 600 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) together?
Keep the aquarium between 24°C and 28°C. A target of around 26.0°C sits comfortably within both species' preferred ranges.
Are Alligator Pleco or Chao Phraya Giant Catfish (Paroon Shark) aggressive?
Alligator Pleco is generally mild-mannered (3/10) and Chao Phraya Giant Catfish (Paroon Shark) is semi-aggressive (8/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Alligator Pleco and Chao Phraya Giant Catfish (Paroon Shark) need?
Both species overlap in the 6.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Does Alligator Pleco being nocturnal affect compatibility?
Alligator Pleco is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches Alligator Pleco during evening hours.
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