Can Freshwater Shark (Wallago) and Goby Pleco (Pitbull Pleco) Live Together?

Freshwater Shark (Wallago) is a highly aggressive species (10/10), while Goby Pleco (Pitbull Pleco) is peaceful (1/10). This notable difference means Freshwater Shark (Wallago) may occasionally assert dominance over Goby Pleco (Pitbull Pleco).

Large aggression gap (9 points) between Freshwater Shark (Wallago) and Goby Pleco (Pitbull Pleco) increases stress risk for the more peaceful fish.

Freshwater Shark (Wallago) and Goby Pleco (Pitbull Pleco) 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.

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: Aggressive fish may bully and stress shy, slow-moving species. Hyperactive swimmers can stress shy, slow-moving species through constant motion.

Worth noting: Goby Pleco (Pitbull Pleco) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Freshwater Shark (Wallago) is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 20°C and 26°C. Aim for the midpoint of this range (around 23.0°C) for optimal comfort.

Both fish can tolerate a pH between 6 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 4–15 dGH. Regular testing will ensure conditions stay within this range.

To house Freshwater Shark (Wallago) and Goby Pleco (Pitbull Pleco) together, plan for an aquarium of at least 5500 litres with a minimum length of 300 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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding), 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.

Freshwater Shark (Wallago) and Goby Pleco (Pitbull Pleco) 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.