Green neon tetra tank mates
Smaller than regular neons at 2.5 cm with a longer green band. Requires soft acidic blackwater for full colour. Tougher than its label suggests.
Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.
Best tank mates (on file)
Merged from conservative safest and best with fields — de-duplicated by species.
The Green neon tetra profile lists Chili Rasbora as a safe tank mate. Chili Rasbora schools in groups of 8 or more, so plan room for the whole group rather than one fish.
The Green neon tetra profile lists Corydoras Catfish as a recommended pairing. Corydoras Catfish schools in groups of 6 or more, so plan room for the whole group rather than one fish. Corydoras Catfish grows bigger than Green neon tetra (6cm vs 2.5cm). Stock the Green neon tetra group large enough to outnumber the Corydoras Catfish, or the smaller fish ends up bullied or off food. Corydoras Catfish swims in the bottom zone while Green neon tetra stays in the middle, so the two will not crowd the same water column.
The Green neon tetra profile lists Dwarf Gourami as a recommended pairing. Dwarf Gourami grows bigger than Green neon tetra (8cm vs 2.5cm). Stock the Green neon tetra group large enough to outnumber the Dwarf Gourami, or the smaller fish ends up bullied or off food.
The Green neon tetra profile lists Ember Tetra as both safe and a recommended pairing. Ember Tetra schools in groups of 8 or more, so plan room for the whole group rather than one fish.
The Green neon tetra profile lists Harlequin Rasbora as a recommended pairing. Harlequin Rasbora schools in groups of 6 or more, so plan room for the whole group rather than one fish. Harlequin Rasbora grows bigger than Green neon tetra (5cm vs 2.5cm). Stock the Green neon tetra group large enough to outnumber the Harlequin Rasbora, or the smaller fish ends up bullied or off food.
The Green neon tetra profile lists Neon Tetra as a recommended pairing. Neon Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Green neon tetra profile lists Pygmy Corydoras as a safe tank mate. Pygmy Corydoras schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Green neon tetra profile lists Sparkling Gourami as a safe tank mate. Sparkling Gourami schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Risky or situational
From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.
Angelfish reaches 20cm and is flagged predatory or as likely to eat small fish. Adult-size Green neon tetra at 2.5cm is inside that gape range. Angelfish is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Green neon tetra. Run the pair checker before stocking.
Betta is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Green neon tetra. Run the pair checker before stocking.
Serpae Tetra is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Green neon tetra. Run the pair checker before stocking.
Jack Dempsey reaches 25cm and is flagged predatory or as likely to eat small fish. Adult-size Green neon tetra at 2.5cm is inside that gape range. Jack Dempsey is rated aggressive, so expect chasing, fin damage, or display behaviour directed at Green neon tetra. Run the pair checker before stocking.
Tiger Barb is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Green neon tetra. Run the pair checker before stocking.
Fish to avoid with Green neon tetra
From the unsafe list — predation, aggression, or space rules on this profile.
Oscar reaches 35cm and is flagged predatory. Green neon tetra at 2.5cm is prey-sized for it. Oscar needs at least 300L, far above the 60L minimum for Green neon tetra. The tank that houses one stresses the other. Oscar is rated aggressive and Green neon tetra is rated peaceful. No community-style planning carries that gap.
Pea Puffer conflicts with Green neon tetra on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
African Cichlid reaches 15cm and is flagged predatory. Green neon tetra at 2.5cm is prey-sized for it. African Cichlid needs at least 200L, far above the 60L minimum for Green neon tetra. The tank that houses one stresses the other. African Cichlid is rated aggressive and Green neon tetra is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Green neon tetra: 60L — group minimum 8 (schooling).
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other — that is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 60L hub.
Easier alternatives to consider
Conservative beginner-peaceful picks from the library — not replacements for reading, but a shorter on-ramp than this species for a first tank.
Plan before you buy
Pair checks for every mix, then multi-species stocking in the builder.
Filtration & heating
A 60L minimum tank for Green neon tetra needs a filter rated for at least 240L/hr turnover and a heater maintaining 22–27°C.
Similar fish (same category)
- Beckford Pencilfish — min 60L
- Black Neon Tetra — min 60L
- Bloodfin tetra — min 60L
- Cardinal Tetra — min 60L
- Glowlight Tetra — min 60L
- Lemon Tetra — min 60L
- Silver Tip Tetra — min 60L
- X-ray tetra — min 60L