Can Boeseman's Rainbowfish and Fahaka Puffer Live Together?

Boeseman's Rainbowfish is a peaceful species (2/10), while Fahaka Puffer is highly aggressive (10/10). This notable difference means Fahaka Puffer may occasionally assert dominance over Boeseman's Rainbowfish.

Large aggression gap (8 points) between Boeseman's Rainbowfish and Fahaka Puffer increases stress risk for the more peaceful fish.

Boeseman's Rainbowfish and Fahaka Puffer 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.

Worth noting: Boeseman's Rainbowfish is a known jumper, so a tight-fitting lid is essential.

To improve the chances of a peaceful coexistence in this community tank: Provide a significantly larger tank (at least 50% more volume than the minimum) to allow both Boeseman's Rainbowfish and Fahaka Puffer to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations. A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.

The safe temperature window for both species falls between 26°C and 29°C. Aim for the midpoint of this range (around 27.5°C) for optimal comfort.

Both fish can tolerate a pH between 7 and 8.1. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 9–15 dGH. Regular testing will ensure conditions stay within this range.

To house Boeseman's Rainbowfish and Fahaka Puffer together, plan for an aquarium of at least 540 litres with a minimum length of 150 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.

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 - lighly covered, 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.