Guppy and Neon Rainbowfish Compatibility Overview
Short answer: Yes. Both do well at 73-82°F and both are peaceful. Match the tank size and group size in the table below and both should do well.
Guppy and Neon Rainbowfish can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Guppy | Neon Rainbowfish | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 73–82°F | ✅ 73–82°F |
| pH Range | 6.8–8.5 | 6.8–7.5 | ⚠️ 6.8–7.5 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 2.5 in | 3.1 in | ✅ Similar |
| Min. Group | 3+ | 6+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
Compatibility Positives
Caution Points
Species Profiles
Guppy — Poecilia reticulata
Hardy and colourful livebearers. Males' long flowing tails make them targets for fin-nipping species. Very prolific breeders.
Neon Rainbowfish — Melanotaenia praecox
The Neon Rainbowfish, known for its vibrant colors, is a popular addition to freshwater aquariums. These fish are generally peaceful and can be kept in community tanks with other peaceful species. They require a well-maintained tank with a good water flow and plenty of swimming space. Regular water changes and a balanced diet are essential for their health.
Frequently Asked Questions
Can Guppy live with Neon Rainbowfish?
Yes, in a well-planned setup. Guppy and Neon Rainbowfish can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Guppy and Neon Rainbowfish together?
A minimum of 55 gallons is recommended for keeping Guppy and Neon Rainbowfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Guppy and Neon Rainbowfish?
73–82°F — inside Guppy's 72–82°F and Neon Rainbowfish's 73–82°F.
Is a Guppy aggressive toward a Neon Rainbowfish?
Guppy is peaceful and Neon Rainbowfish is peaceful. No major aggression issues are expected between these species.
More Good Tank Mates for Guppy and Neon Rainbowfish
The highest-scoring compatible partners for each species in our compatibility data.
For Guppy
- Molly — 96/100
- Clown Pleco — 95/100
- Pearl Danio — 93/100
- Zebra Danio — 93/100
- Mystery Snail — 92/100
For Neon Rainbowfish
- Clown Pleco — 98/100
- Dwarf Chain Loach — 98/100
- Sterbai Cory — 98/100
- Cherry Barb — 96/100
- Congo Tetra — 96/100
Related Compatibility Guides
Tank Size for Guppy and Neon Rainbowfish
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 55 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 75 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 125 gal | Best when keeping larger schools or reducing territorial pressure. |