Candidate
Neon tetra
Paracheirodon innesi
A substantial shoal can become the primary midwater feature.
- Adult
- 3–4 cm
- Minimum
- 60 L · 60 cm
- Group
- 8
Condition-led guide · reviewed 2026-07-31
Fish for a 75 litre aquarium
This volume opens several classic community species, but group size and a 75-80 cm swim length remain decisive.
Selection rules
What made the shortlist
- Confirm at least 75 cm of swim length for species that require it.
- Reserve the entire social-group allowance before considering companions.
- Check the narrowest shared temperature, pH and GH range.
Real photographed species
Options worth researching
Use one midwater group and only add a lower-zone group if the combined plan passes water and space checks.
Candidate
Black neon tetra
Hyphessobrycon herbertaxelrodi
An active shoal suits an 80 cm footprint better than a short tall tank.
- Adult
- 3–4 cm
- Minimum
- 72 L · 80 cm
- Group
- 8
Candidate
Panda corydoras
Corydoras panda
A group can work where the floor is long, fine and well oxygenated.
- Adult
- 5–6 cm
- Minimum
- 75 L · 75 cm
- Group
- 6
Candidate
Kuhli loach
Pangio kuhlii
A social group fits a covered, mature aquarium with dense crevice shelter.
- Adult
- 8–12 cm
- Minimum
- 75 L · 75 cm
- Group
- 6
Common mismatch
Fish to rule out for this brief
A 75 litre cube is not equivalent to a 75 litre long tank for active shoalers.
Think again
Congo tetra
Phenacogrammus interruptus
Its adult group needs considerably more swimming length.
- Adult
- 6–9 cm
- Minimum
- 150 L · 100 cm
- Group
- 8
Think again
Yoyo loach
Botia almorhae
A proper group becomes too substantial and active.
- Adult
- 12–16 cm
- Minimum
- 180 L · 120 cm
- Group
- 5
Think again
Oscar
Astronotus ocellatus
One adult requires a much larger species-led system.
- Adult
- 30–35 cm
- Minimum
- 300 L · 120 cm
- Group
- 1