Can Agassiz's Dwarf Cichlid and Figure 8 Puffer (Brackish) Live Together?
Agassiz's Dwarf Cichlid and Figure 8 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
Agassiz's Dwarf Cichlid is a moderately assertive species (5/10), while Figure 8 Puffer (Brackish) is semi-aggressive (8/10). This modest difference means Figure 8 Puffer (Brackish) may occasionally assert dominance over Agassiz's Dwarf Cichlid.
Agassiz's Dwarf Cichlid and Figure 8 Puffer (Brackish) 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.
Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species. Hyperactive swimmers can stress shy, slow-moving species through constant motion. Two territorial species may clash over territory, especially in smaller tanks.
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 Agassiz's Dwarf Cichlid (4.5–7) and Figure 8 Puffer (Brackish) (7.5–8.5) do not overlap, making it impossible to satisfy both species simultaneously.
Hardness requirements are incompatible: Agassiz's Dwarf Cichlid needs 1–8 dGH while Figure 8 Puffer (Brackish) requires 10–25 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 Agassiz's Dwarf Cichlid and Figure 8 Puffer (Brackish) together, plan for an aquarium of at least 72 litres with a minimum length of 60 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: Sand (Sifters), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Densely covered, Shells (Breeding/Hiding). Meeting these requirements will help both species thrive.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Find the right tank equipment
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Frequently Asked Questions
Can Agassiz's Dwarf Cichlid and Figure 8 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 Agassiz's Dwarf Cichlid and Figure 8 Puffer (Brackish) need?▾
A minimum of 72 litres (tank length at least 60 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 Agassiz's Dwarf Cichlid and Figure 8 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 Agassiz's Dwarf Cichlid or Figure 8 Puffer (Brackish) aggressive?▾
Agassiz's Dwarf Cichlid is moderately assertive (5/10) and Figure 8 Puffer (Brackish) is semi-aggressive (8/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Agassiz's Dwarf Cichlid and Figure 8 Puffer (Brackish) need?▾
Their pH requirements do not overlap. Agassiz's Dwarf Cichlid prefers 4.5–7, while Figure 8 Puffer (Brackish) needs 7.5–8.5. This makes them incompatible in the same water chemistry.
Will Figure 8 Puffer (Brackish) nip Agassiz's Dwarf Cichlid's fins?▾
Figure 8 Puffer (Brackish) is a known fin nipper. If Agassiz's Dwarf Cichlid has long or flowing fins, there is a real risk of fin damage. Keeping Figure 8 Puffer (Brackish) in a larger group can help redirect nipping behaviour toward conspecifics.
How do I manage Agassiz's Dwarf Cichlid's territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Agassiz's Dwarf Cichlid 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.
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