Can Aequidens diadema (Diadem Cichlid) and Ceylon Puffer (Brackish) Live Together?

Aequidens diadema (Diadem Cichlid) is a moderately assertive species (6/10), while Ceylon Puffer (Brackish) is semi-aggressive (8/10). This modest difference means Ceylon Puffer (Brackish) may occasionally assert dominance over Aequidens diadema (Diadem Cichlid).

Aequidens diadema (Diadem Cichlid) and Ceylon Puffer (Brackish) both frequent the Middle (Open Water) and 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.

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 7.5 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 12–15 dGH. Regular testing will ensure conditions stay within this range.

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.

To house Aequidens diadema (Diadem Cichlid) and Ceylon Puffer (Brackish) together, plan for an aquarium of at least 200 litres with a minimum length of 90 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

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), Driftwood (Digestion/Hiding), 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.