Can Arapaima and Glass Catfish Live Together?
Keeping Arapaima and Glass Catfish together is possible but requires caution due to differing aggression levels and potential behavioral clashes. 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 Arapaima and Glass Catfish?
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.
Shared setup supplies
We may earn from qualifying purchases
Behaviour & Temperament
Arapaima is a semi-aggressive species (7/10), while Glass Catfish is peaceful (1/10). This notable difference means Arapaima may occasionally assert dominance over Glass Catfish.
Large aggression gap (6 points) between Arapaima and Glass Catfish increases stress risk for the more peaceful fish.
Arapaima and Glass Catfish both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.
Worth noting: Arapaima 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 and 7. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 2–10 dGH. Regular testing will ensure conditions stay within this range.
Water care products
We may earn from qualifying purchases
Tank Setup
To house Arapaima and Glass Catfish 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: Plants - Densely covered, Plants - Floating. Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Arapaima is a plant destroyer, which conflicts with Glass Catfish's requirement for live plants. Compromise where possible or prioritise the more critical need.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Feeding products to consider
We may earn from qualifying purchases
.webp?2026-04-25T14%3A35%3A38.022Z)
Frequently Asked Questions
Can Arapaima and Glass Catfish 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 Arapaima and Glass Catfish 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 Arapaima and Glass Catfish 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 Arapaima or Glass Catfish aggressive?
Arapaima is semi-aggressive (7/10) and Glass Catfish is peaceful (1/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Arapaima and Glass Catfish need?
Both species overlap in the 6–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Related Comparisons
Arapaima & Orangespotted Snakehead
·
Arapaima & African Butterfly Fish
·
Arapaima & African Knifefish
·
Arapaima & Emperor Snakehead
·
Arapaima & Longnose Gar
·
Arapaima & African Lungfish
·
Glass Catfish & Debauwi Catfish (Three-Striped Glass Catfish)
·
Glass Catfish & Dwarf Cory (Tailspot Cory)
·
Glass Catfish & Dwarf Petricola
·
Glass Catfish & Golden Oto
·
Glass Catfish & Iridescent Shark
·
Glass Catfish & Otocinclus
·