Can German Blue Ram and Red Rainbowfish Live Together?

German Blue Ram is a generally mild-mannered species (4/10), while Red Rainbowfish is generally mild-mannered (3/10). This modest difference means German Blue Ram may occasionally assert dominance over Red Rainbowfish.

German Blue Ram and Red Rainbowfish 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. Aggressive eaters may outcompete shy fish for food, leading to malnutrition.

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

The safe temperature window for both species falls between 27°C and 28°C. Aim for the midpoint of this range (around 27.5°C) for optimal comfort.

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

Hardness requirements are incompatible: German Blue Ram needs 1–8 dGH while Red Rainbowfish requires 10–25 dGH. An aquarium test kit is recommended for monitoring.

To house German Blue Ram and Red Rainbowfish together, plan for an aquarium of at least 240 litres with a minimum length of 120 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), Plants - Densely covered, Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, Plants - Floating. 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.

Feeding time deserves special attention with this pairing. Red Rainbowfish is an aggressive eater that may prevent German Blue Ram from getting enough food.

Because Red Rainbowfish is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure German Blue Ram receives an adequate share.