Can Flash Pleco (L204) and Flavus Cichlid (Pseudotropheus Flavus) Live Together?

Flash Pleco (L204) is a generally mild-mannered species (4/10), while Flavus Cichlid (Pseudotropheus Flavus) is semi-aggressive (8/10). This notable difference means Flavus Cichlid (Pseudotropheus Flavus) may occasionally assert dominance over Flash Pleco (L204).

Flash Pleco (L204) and Flavus Cichlid (Pseudotropheus Flavus) 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.

Worth noting: Flash Pleco (L204) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.

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 Flash Pleco (L204) (6–7.5) and Flavus Cichlid (Pseudotropheus Flavus) (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.

To house Flash Pleco (L204) and Flavus Cichlid (Pseudotropheus Flavus) together, plan for an aquarium of at least 279 litres with a minimum length of 120 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: Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels), Sand (Sifters), Established Algae (Otocinclus). 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.

Flash Pleco (L204) and Flavus Cichlid (Pseudotropheus Flavus) are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.