Fish comparison
Celestial Pearl Danio vs Reticulated Hillstream Loach
How the Celestial Pearl Danio and Reticulated Hillstream Loach compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Celestial Pearl Danio vs Reticulated Hillstream Loach
The Celestial Pearl Danio and the Reticulated Hillstream Loach come up together a lot when people are choosing a fish, and they are close enough to weigh side by side. Both are happy somewhere around 20 to 24 °C and pH 6.5 to 7.5, so a single tank can suit either one. The Celestial Pearl Danio is the more forgiving of the two, which matters if this is an early tank, while the Reticulated Hillstream Loach rewards a bit more attention. If tank space is tight, the Celestial Pearl Danio needs less room to feel settled; give the Reticulated Hillstream Loach the nod when you have the litres to spare.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
2 notes
Temperature
- Celestial Pearl Danio20–24 °C
- Reticulated Hillstream Loach20–24 °C
pH
- Celestial Pearl Danio6.5–7.5
- Reticulated Hillstream Loach6.5–7.5
Hardness
- Celestial Pearl Danio2–10 dGH
- Reticulated Hillstream Loach4–15 dGH
What to plan for
- Celestial Pearl Danio schools, stock at least 6You've planned for 1 celestial pearl danio. Celestial Pearl Danio need a group of at least 6 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- 67% of your fish swim in the bottomHeavy 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 |  FishCelestial Pearl DanioDanio margaritatus |  FishReticulated Hillstream LoachSewellia lineolata |
|---|---|---|
| Category | Fish | Fish |
| Origin | Hopong area, Myanmar | Central and southern Vietnam |
| Family | Cyprinidae | Gastromyzontidae |
| Temperature | 20–24 °C | 20–24 °C |
| pH | 6.5–7.5 | 6.5–7.5 |
| Hardness (dGH) | 2–10 | 4–15 |
| Flow rate | Low | Very High |
| Min tank | 40 L | 75 L |
| Adult size | 2–2.5 cm | 5–7 cm |
| Difficulty | 2 / 5 | 3 / 5 |
| Lifespan | 3–5 yrs | 8–10 yrs |
| Diet | Micropredator | Herbivore (biofilm and algae) |
| Water column | Mid to Bottom | Bottom (sticks to surfaces) |
| Schooling | Yes (loose shoal) | Loose group |
| Plant safe | Yes | Yes |
| Shrimp safe | Yes (adult shrimp) | Yes |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Celestial Pearl Danio and Reticulated Hillstream Loach together?
Yes. Their temperature and pH ranges overlap around 20 to 24 °C and pH 6.5 to 7.5, 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 Celestial Pearl Danio or the Reticulated Hillstream Loach?
The Celestial Pearl Danio is the easier of the two, closer to beginner-friendly, while the Reticulated Hillstream Loach leans middle-of-the-road.
Do Celestial Pearl Danio and Reticulated Hillstream Loach need the same water?
Close to it. Aim for 20 to 24 °C and pH 6.5 to 7.5 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Celestial Pearl Danio and the Reticulated Hillstream Loach?
Space. The Celestial Pearl Danio wants about 40 litres minimum and the Reticulated Hillstream Loach around 75, so tank size can settle it.