Can Badis (Chameleon Fish) and Freshwater Harlequin Shrimp (Sulawesi) Live Together?

Badis (Chameleon Fish) is a moderately assertive species (5/10), while Freshwater Harlequin Shrimp (Sulawesi) is peaceful (0/10). This notable difference means Badis (Chameleon Fish) may occasionally assert dominance over Freshwater Harlequin Shrimp (Sulawesi).

Badis (Chameleon Fish) and Freshwater Harlequin Shrimp (Sulawesi) 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: Shrimp eaters may also prey on very small nano fish.

Worth noting: Freshwater Harlequin Shrimp (Sulawesi) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.

There is no temperature overlap between Badis (Chameleon Fish) (15–25°C) and Freshwater Harlequin Shrimp (Sulawesi) (26–30°C). This fundamental mismatch makes long-term cohabitation impractical.

Both fish can tolerate a pH between 7.5 and 8. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 4–8 dGH. Regular testing will ensure conditions stay within this range.

To house Badis (Chameleon Fish) and Freshwater Harlequin Shrimp (Sulawesi) together, plan for an aquarium of at least 60 litres with a minimum length of 60 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), Plants - Densely covered, Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, Established Algae (Otocinclus), Smooth Gravel (Sensitive Barbels). 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.

Badis (Chameleon Fish) and Freshwater Harlequin Shrimp (Sulawesi) 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. Badis (Chameleon Fish) is a known shrimp eater and may prey on small invertebrates or nano fish like Freshwater Harlequin Shrimp (Sulawesi).