Can Red Phantom Tetra and Tiger Loach Live Together?

Red Phantom Tetra is a peaceful species (1/10), while Tiger Loach is semi-aggressive (8/10). This notable difference means Tiger Loach may occasionally assert dominance over Red Phantom Tetra.

Large aggression gap (7 points) between Red Phantom Tetra and Tiger Loach increases stress risk for the more peaceful fish.

In terms of spatial distribution, Red Phantom Tetra prefers the Middle (Open Water) zone, whereas Tiger Loach occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

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.

There is no temperature overlap between Red Phantom Tetra (20–24°C) and Tiger Loach (25–30°C). This fundamental mismatch makes long-term cohabitation impractical.

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 2–10 dGH. Regular testing will ensure conditions stay within this range.

To house Red Phantom Tetra and Tiger Loach together, plan for an aquarium of at least 250 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: Plants - Densely covered, Plants - Floating, Leaf Litter/Blackwater, Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.

Red Phantom Tetra prefers Low (Still Water) flow while Tiger Loach needs High (River/Stream) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.

Red Phantom Tetra and Tiger Loach 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.