Guppy and Rainbow Shark Compatibility Overview
Short answer: Yes. Both do well at 72-79°F. Match the tank size and group size in the table below and both should do well.
Guppy and Rainbow Shark can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Guppy is peaceful and Rainbow Shark is semi, so give them room and cover rather than assuming they will ignore each other. A minimum 75-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Guppy | Rainbow Shark | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 72–79°F | ✅ 72–79°F |
| pH Range | 6.8–8.5 | 6.5–7.5 | ⚠️ 6.8–7.5 (narrow) |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 2.5 in | 6 in | ⚠️ 2.4× difference |
| Min. Group | 3+ | 1+ | See below |
| Min. Tank Size | 75 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.
Rainbow Shark — Epalzeorhynchos frenatum
Active bottom dweller that becomes territorial at maturity. One per tank; avoid other shark-like or bottom-dwelling species.
Frequently Asked Questions
Can Guppy live with Rainbow Shark?
Yes, in a well-planned setup. Guppy and Rainbow Shark can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Guppy is peaceful and Rainbow Shark is semi, so give them room and cover rather than assuming they will ignore each other. A minimum 75-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Guppy and Rainbow Shark together?
A minimum of 75 gallons is recommended for keeping Guppy and Rainbow Shark together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Guppy and Rainbow Shark?
72–79°F — inside Guppy's 72–82°F and Rainbow Shark's 72–79°F.
Is a Guppy aggressive toward a Rainbow Shark?
Guppy is peaceful and Rainbow Shark is semi. No major aggression issues are expected between these species.
More Good Tank Mates for Guppy and Rainbow Shark
The highest-scoring compatible partners for each species in our compatibility data.
For Guppy
- Molly — 96/100
- Neon Rainbowfish — 96/100
- Clown Pleco — 95/100
- Pearl Danio — 93/100
- Zebra Danio — 93/100
For Rainbow Shark
- Bristlenose Pleco — 92/100
- Zebra Loach — 92/100
- Keyhole Cichlid — 90/100
- Clown Pleco — 89/100
- Yoyo Loach — 89/100
Related Compatibility Guides
Tank Size for Guppy and Rainbow Shark
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 75 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 125 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 150 gal | Best when keeping larger schools or reducing territorial pressure. |