Guppies and Neon Tetras, side by side
| Guppy | Neon tetra | |
|---|---|---|
| Adult size | 2 in5 cm | 1.4 in3.5 cm |
| Smallest tank | 10 gal38 L | 10 gal38 L |
| Keep | 3 or more | 6 or more |
| Temperature | 72–82 °F22–28 °C | 70–79 °F21–26 °C |
| pH | 7–8.2 | 5.5–7.5 |
| Temperament | Peaceful | Peaceful |
| Swims | Near the top | In the middle |
What size tank do they need together?
Each row shows how many of each the tank carries comfortably when these are the only two kinds in it.
| Tank | Guppy | Neon tetra |
|---|---|---|
| 5 gallon | Too small for both | |
| 10 gallon | Too small for both | |
| 20 gallon long | 4 | 9 |
| 29 gallon | 6 | 13 |
| 40 gallon breeder | 9 | 16 |
| 55 gallon | 12 | 23 |
| 75 gallon | 16 | 30 |
| 125 gallon | 27 | 30 |
Open this pair in the stocking calculator to add more fish or try your own tank.
How to make it work
- Add the calmer, smaller fish first, and the larger fish last.
- Use plants, wood or rocks to break up the view across the tank. Fish that cannot see each other all day fight less.
- Watch closely for the first week. Torn fins, hiding or a fish that stops eating mean it is not working.
- Keep a spare tank or a divider ready, so you can separate them the same day.
Questions and answers
Can guppies and neon tetras live in the same tank?
Yes, usually. Guppies and neon tetras like the same water: 72–79 °F (22–26 °C) and a pH of 7–7.5. Guppies spend their time near the top and neon tetras in the middle, so they stay out of each other's way.
What size tank do guppies and neon tetras need together?
At least a 20 gallon long tank, which carries about 4 guppies and 9 neon tetras comfortably.
What temperature suits guppies and neon tetras?
72–79 °F (22–26 °C) suits both.
More pairs
- Guppies and bettas
- Guppies and fancy goldfish
- Guppies and angelfish
- Guppies and bronze corydoras
- Guppies and mollies
- Neon tetras and platies
- Neon tetras and tiger barbs
- Neon tetras and dwarf gouramis
- Neon tetras and cherry shrimp
- All pairs
Based on each species' adult size, water range and temperament (Seriously Fish, FishBase) and the rules of our stocking calculator. Individual fish differ: this is a guide, not a guarantee.