Can Black Ocellatus and Green Neon Tetra Live Together?

Black Ocellatus is a semi-aggressive species (7/10), while Green Neon Tetra is peaceful (0/10). This notable difference means Black Ocellatus may occasionally assert dominance over Green Neon Tetra.

Large aggression gap (7 points) between Black Ocellatus and Green Neon Tetra increases stress risk for the more peaceful fish.

In terms of spatial distribution, Black Ocellatus prefers the Bottom (Substrate) zone, whereas Green Neon Tetra occupies the Middle (Open Water) 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: Shrimp eaters may also prey on very small nano fish.

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 Black Ocellatus (7.5–9) and Green Neon Tetra (4.5–6.5) do not overlap, making it impossible to satisfy both species simultaneously.

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

To house Black Ocellatus and Green Neon Tetra together, plan for an aquarium of at least 40 litres with a minimum length of 45 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), Shells (Breeding/Hiding), Leaf Litter/Blackwater, Plants - Densely covered, Plants - Floating. 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.

Black Ocellatus and Green Neon Tetra 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. Black Ocellatus is a known shrimp eater and may prey on small invertebrates or nano fish like Green Neon Tetra.