Can Largemouth Bass and Peacock Gudgeon Live Together?

Largemouth Bass is a semi-aggressive species (8/10), while Peacock Gudgeon is peaceful (2/10). This notable difference means Largemouth Bass may occasionally assert dominance over Peacock Gudgeon.

Large aggression gap (6 points) between Largemouth Bass and Peacock Gudgeon increases stress risk for the more peaceful fish.

Largemouth Bass and Peacock Gudgeon 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.

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

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. Shrimp eaters may also prey on very small nano fish.

Worth noting: Largemouth Bass is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 22°C and 26°C. Aim for the midpoint of this range (around 24.0°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 5–10 dGH. Regular testing will ensure conditions stay within this range.

To house Largemouth Bass and Peacock Gudgeon together, plan for an aquarium of at least 1135 litres with a minimum length of 240 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), Plants - Densely covered, Smooth Gravel (Sensitive Barbels). 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.

Largemouth Bass and Peacock Gudgeon 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.

Feeding time deserves special attention with this pairing. Largemouth Bass is a known shrimp eater and may prey on small invertebrates or nano fish like Peacock Gudgeon. Largemouth Bass is an aggressive eater that may prevent Peacock Gudgeon from getting enough food.

Because Largemouth Bass is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Peacock Gudgeon receives an adequate share.