Fish comparison
Clown Pleco vs Otocinclus (Common)
How the Clown Pleco and Otocinclus (Common) compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Clown Pleco vs Otocinclus (Common)
The Clown Pleco and the Otocinclus (Common) 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 23 to 26 °C and pH 6.5 to 7.5, so a single tank can suit either one. The Clown Pleco is the more forgiving of the two, which matters if this is an early tank, while the Otocinclus (Common) rewards a bit more attention. If tank space is tight, the Otocinclus (Common) needs less room to feel settled; give the Clown Pleco the nod when you have the litres to spare.
Group compatibility overview
Good fit
Workable as-is, only minor advisories to plan around.
1 warning · 1 note
Temperature
- Clown Pleco23–29 °C
- Otocinclus (Common)20–26 °C
pH
- Clown Pleco6.5–7.8
- Otocinclus (Common)6–7.5
Hardness
- Clown Pleco5–15 dGH
- Otocinclus (Common)2–10 dGH
What to plan for
- Otocinclus (Common) schools, stock at least 6You've planned for 1 otocinclus (common). Otocinclus (Common) 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.
- All fish are bottom-dwellersTop and middle of the tank will look empty, and surface food drops uneaten. Add a mid or top species (rasboras, danios, hatchetfish) to use the whole water column.
Full attributes
Every parameter, side by side| Parameter |  FishClown PlecoPanaqolus maccus |  FishOtocinclus (Common)Otocinclus vittatus |
|---|---|---|
| Category | Fish | Fish |
| Origin | Venezuela and Colombia | Northern and central South America |
| Family | Loricariidae | Loricariidae |
| Temperature | 23–29 °C | 20–26 °C |
| pH | 6.5–7.8 | 6.0–7.5 |
| Hardness (dGH) | 5–15 | 2–10 |
| Flow rate | Medium | Medium to High |
| Min tank | 90 L | 60 L |
| Adult size | 9–10 cm | 3.5–5 cm |
| Difficulty | 2 / 5 | 3 / 5 |
| Lifespan | 10–12 yrs | 3–5 yrs |
| Diet | Herbivore (wood-eater) | Herbivore (algae) |
| Water column | Bottom | Bottom (grazes everywhere) |
| Schooling | No | Yes |
| Plant safe | Yes | Yes |
| Shrimp safe | Yes | Yes |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Clown Pleco and Otocinclus (Common) together?
Yes. Their temperature and pH ranges overlap around 23 to 26 °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 Clown Pleco or the Otocinclus (Common)?
The Clown Pleco is the easier of the two, closer to beginner-friendly, while the Otocinclus (Common) leans middle-of-the-road.
Do Clown Pleco and Otocinclus (Common) need the same water?
Close to it. Aim for 23 to 26 °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 Clown Pleco and the Otocinclus (Common)?
Space. The Clown Pleco wants about 90 litres minimum and the Otocinclus (Common) around 60, so tank size can settle it.