Possible, but with meaningful cautions
Their pH overlap is narrow.
Practical response: Confirm your stable source-water pH sits within the shared range.
Rummy-nose Tetra
- Adult size
- 5 cm / 2 in
- Tank reference
- 75+ L / 19.8+ US gal
- Group
- 8+
- Zone
- mid
- Temperature
- 24–28°C / 75.2–82.4°F
Guppy
- Adult size
- 5 cm / 2 in
- Tank reference
- 40+ L / 10.6+ US gal
- Group
- 3+
- Zone
- top
- Temperature
- 22–28°C / 71.6–82.4°F
Water parameter overlap
Behavior and space
An active, tight-schooling tetra that rewards stable water quality and generous swimming length. A prolific livebearer; plan for fry or single-sex groups and avoid persistent fin-nippers.
A compatibility answer should also consider the actual tank dimensions, number of each fish, filtration, planting and other occupants. Two species can be reasonable together in a long, structured aquarium yet become a poor pairing when compressed into a small footprint.
Common questions
Can Rummy-nose Tetra live with Guppy?
The StockingLab verdict is caution: Their pH overlap is narrow.
Do their temperatures overlap?
24–28°C / 75.2–82.4°F shared range.
Should I trust compatibility calculators completely?
No. Individual behavior, sex ratios, breeding condition, aquascape and tank size can change the outcome. Use the result to identify risks, then verify care requirements before purchase.