Can Glass Catfish and Green Spotted Puffer (Brackish) Live Together?
Glass Catfish and Green Spotted Puffer (Brackish) are not recommended as tank mates due to incompatible water types and conflicting pH requirements and incompatible hardness ranges. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Behaviour & Temperament
Glass Catfish is a peaceful species (1/10), while Green Spotted Puffer (Brackish) is highly aggressive (9/10). This notable difference means Green Spotted Puffer (Brackish) may occasionally assert dominance over Glass Catfish.
Large aggression gap (8 points) between Glass Catfish and Green Spotted Puffer (Brackish) increases stress risk for the more peaceful fish.
Glass Catfish and Green Spotted Puffer (Brackish) 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: Aggressive fish may bully and stress shy, slow-moving species.
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.
The pH requirements of Glass Catfish (6–7) and Green Spotted Puffer (Brackish) (7.5–8.5) do not overlap, making it impossible to satisfy both species simultaneously.
Hardness requirements are incompatible: Glass Catfish needs 1–10 dGH while Green Spotted Puffer (Brackish) requires 12–30 dGH.
Crucially, these species require different water types — one needs freshwater while the other requires brackish conditions. This is a hard barrier to keeping them together. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Glass Catfish and Green Spotted Puffer (Brackish) together, plan for an aquarium of at least 137 litres with a minimum length of 90 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.
Specific environmental needs for this combination include: Plants - Densely covered, Plants - Floating, Sand (Sifters), Shells (Breeding/Hiding). 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.
Find the right tank equipment
Browse tanks, décor, and equipment suited for this setup.
Frequently Asked Questions
Can Glass Catfish and Green Spotted Puffer (Brackish) live together?▾
No. This combination is not recommended. Key incompatibilities — such as different water type needs — make cohabitation unsafe.
What size tank do Glass Catfish and Green Spotted Puffer (Brackish) need?▾
A minimum of 137 litres (tank length at least 90 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 Glass Catfish and Green Spotted Puffer (Brackish) 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 Glass Catfish or Green Spotted Puffer (Brackish) aggressive?▾
Glass Catfish is peaceful (1/10) and Green Spotted Puffer (Brackish) is highly aggressive (9/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Glass Catfish and Green Spotted Puffer (Brackish) need?▾
Their pH requirements do not overlap. Glass Catfish prefers 6–7, while Green Spotted Puffer (Brackish) needs 7.5–8.5. This makes them incompatible in the same water chemistry.
Will Green Spotted Puffer (Brackish) nip Glass Catfish's fins?▾
Green Spotted Puffer (Brackish) is a known fin nipper. If Glass Catfish has long or flowing fins, there is a real risk of fin damage. Keeping Green Spotted Puffer (Brackish) in a larger group can help redirect nipping behaviour toward conspecifics.
How do I manage Green Spotted Puffer (Brackish)'s territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Green Spotted Puffer (Brackish) space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
Related Comparisons
Glass Catfish & Iridescent Shark
·
Glass Catfish & Otocinclus
·
Glass Catfish & Pygmy Corydoras
·
Glass Catfish & Twig Catfish (Farlowella)
·
Glass Catfish & Bristlenose Pleco
·
Glass Catfish & Bronze Corydoras
·
Green Spotted Puffer (Brackish) & Figure 8 Puffer (Brackish)
·
Green Spotted Puffer (Brackish) & Fahaka Puffer
·
Green Spotted Puffer (Brackish) & Mbu Puffer
·
Green Spotted Puffer (Brackish) & Dwarf Pea Puffer
·
Green Spotted Puffer (Brackish) & Amazon Puffer
·
Green Spotted Puffer (Brackish) & African Jewel Cichlid
·