The short answer
A 60 litre tank comfortably holds 10–12 neon tetras as a healthy school, with room to spare for a small bottom group or a cleanup crew. If you want neons as the only fish, a bigger shoal of 12–15 looks fantastic and behaves more naturally. Never keep fewer than six — neons are shoaling fish and become nervous and washed-out in small numbers.
Why the group size matters
The old “inch of fish per gallon” rule misses the point with schooling fish. Neon tetras need numbers to feel secure — a group of six is the bare minimum, and ten or more brings out their best colour and tighter shoaling. What limits the count is not just water volume but bioload, temperament and filtration: neons are small and light on waste, so 60 litres handles a good-sized school easily.
Stocking neons well in 60 litres
- 10–12 neon tetras + 6 pygmy corydoras and a snail crew
- 12–15 neon tetras as a single showcase school
- Neons + a peaceful cherry shrimp colony
- Neons alongside one small rasbora school, if you stock slowly
Avoid mixing neons with fin-nippers or anything big enough to see them as food. Keep the water warm, stable and well planted so they show their best colour.
Before you add anything
Neons are sensitive to unstable water, so cycle the tank fully before adding them and introduce the school in one or two batches. Keep up weekly water changes and acclimate them slowly. For the wider picture, see how many fish in a 60 litre tank and the best 60 litre aquariums.