Fish comparison
Glowlight Tetra vs Rummynose Tetra
How the Glowlight Tetra and Rummynose Tetra compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Glowlight Tetra vs Rummynose Tetra
The Glowlight Tetra and the Rummynose Tetra are close cousins, both in the Hemigrammus group, so at a glance they ask for a lot of the same things. Both are happy somewhere around 22 to 27 °C and pH 5.5 to 7, so a single tank can suit either one. The Glowlight Tetra is the more forgiving of the two, which matters if this is an early tank, while the Rummynose Tetra rewards a bit more attention. If tank space is tight, the Glowlight Tetra needs less room to feel settled; give the Rummynose Tetra the nod when you have the litres to spare.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
4 notes
Temperature
- Glowlight Tetra22–28 °C
- Rummynose Tetra22–27 °C
pH
- Glowlight Tetra5.5–7
- Rummynose Tetra5.5–7
Hardness
- Glowlight Tetra1–8 dGH
- Rummynose Tetra2–8 dGH
What to plan for
- Glowlight Tetra schools, stock at least 8You've planned for 1 glowlight tetra. Glowlight Tetra need a group of at least 8 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- Rummynose Tetra schools, stock at least 10You've planned for 1 rummynose tetra. Rummynose Tetra need a group of at least 10 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- No bottom teamNo bottom-dwelling fish or shrimp. A small group of corydoras or a shrimp colony picks up leftover food and keeps detritus in check.
- 100% of your fish swim in the midHeavy concentration in a single zone. Spreading stocking across all three levels makes the tank read fuller for the same bioload.
Full attributes
Every parameter, side by side| Parameter |  FishGlowlight TetraHemigrammus erythrozonus |  FishRummynose TetraHemigrammus rhodostomus |
|---|---|---|
| Category | Fish | Fish |
| Origin | Essequibo River basin, Guyana | Lower Amazon basin, Brazil |
| Family | Characidae | Characidae |
| Temperature | 22–28 °C | 22–27 °C |
| pH | 5.5–7.0 | 5.5–7.0 |
| Hardness (dGH) | 1–8 | 2–8 |
| Flow rate | Low to Medium | Medium |
| Min tank | 60 L | 75 L |
| Adult size | 3.5–4 cm | 4.5–5.5 cm |
| Difficulty | 1 / 5 | 3 / 5 |
| Lifespan | 4–6 yrs | 5–8 yrs |
| Diet | Omnivore | Omnivore |
| Water column | Mid | Mid |
| Schooling | Yes | Yes (tight shoal) |
| Plant safe | Yes | Yes |
| Shrimp safe | Mostly (may eat shrimplets) | Mostly (may eat shrimplets) |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Glowlight Tetra and Rummynose Tetra together?
Yes. Their temperature and pH ranges overlap around 22 to 27 °C and pH 5.5 to 7, so one set of water conditions keeps both comfortable. Match group sizes and cover the usual planted-tank basics and they share a tank fine.
Which is easier to keep, the Glowlight Tetra or the Rummynose Tetra?
The Glowlight Tetra is the easier of the two, closer to very easy, while the Rummynose Tetra leans middle-of-the-road.
Do Glowlight Tetra and Rummynose Tetra need the same water?
Close to it. Aim for 22 to 27 °C and pH 5.5 to 7 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Glowlight Tetra and the Rummynose Tetra?
Space. The Glowlight Tetra wants about 60 litres minimum and the Rummynose Tetra around 75, so tank size can settle it.