Can Rachov's Killifish (Annual) and Red Devil Cichlid Live Together?

Rachov's Killifish (Annual) is a generally mild-mannered species (3/10), while Red Devil Cichlid is highly aggressive (10/10). This notable difference means Red Devil Cichlid may occasionally assert dominance over Rachov's Killifish (Annual).

Large aggression gap (7 points) between Rachov's Killifish (Annual) and Red Devil Cichlid increases stress risk for the more peaceful fish.

Rachov's Killifish (Annual) and Red Devil Cichlid 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.

There is a critical concern: the Nano / Bite-sized (Predation Risk) behaviour of one fish directly conflicts with the Piscivore (Eats small/nano fish) trait of the other — piscivorous fish will prey on nano-sized tank mates..

Worth noting: Rachov's Killifish (Annual) is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 24°C and 26°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 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 6–12 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.

To house Rachov's Killifish (Annual) and Red Devil Cichlid together, plan for an aquarium of at least 336 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: Soil / Nutrient Rich, Leaf Litter/Blackwater, Plants - Densely covered, Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Rachov's Killifish (Annual) requires Soil / Nutrient Rich, while Red Devil Cichlid requires Sand (Sifters). These substrate types may be difficult to provide simultaneously. Rachov's Killifish (Annual) requires Soil / Nutrient Rich, while Red Devil Cichlid requires Smooth Gravel (Sensitive Barbels). These substrate types may be difficult to provide simultaneously. Red Devil Cichlid is a plant destroyer, which conflicts with Rachov's Killifish (Annual)'s requirement for live plants. Compromise where possible or prioritise the more critical need.

Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.