Aquarium Planner

A beginner-friendly fish guide

Otocinclus

Otocinclus

Otocinclus macrospilus

Gentle temperament; social. Check the planner before choosing tank mates.

Beginner level 3/5

A good environment

Recommended temperature
22 ~ 25°C
Recommended pH
6.0 ~ 7.3
Preferred water hardness
Medium hardness
Minimum aquarium
41L or more

Reference sources list a wider range of 21~26°C and pH 5.5~7.5. The planner uses the narrower range above as a safer starting point for beginners.

At a glance

Group
Catfish
Average adult size
about 3.5 cm (small)
Minimum tank length
about 45 cm
Activity level
Moderate
Waste level
Low
Lid recommended
Not required
Mature tank preferred
Yes

Temperament & group size

Gentle temperament; Social.

For a comfortable group, keep at least 3.

Usually swims in the bottom.

Tank-mate notes

Adult shrimp may do well with hiding places, though individual fish vary.

Baby shrimp may still be at risk; watch how your fish behave.

Check each combination carefully, especially when size or temperament differs.

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Frequently asked questions

How big does Otocinclus get, and what tank size does it need?

Adults average about 3.5 cm, a small species. The planner recommends an aquarium of at least 41 L and about 45 cm long.

What water temperature and pH does Otocinclus need?

The planner range is 22~25°C and pH 6.0~7.3, with medium hardness. Reference sources list a wider range of 21~26°C and pH 5.5~7.5. The planner uses the narrower range above as a safer starting point for beginners.

How many Otocinclus should be kept together?

Social: keep at least 3. Temperament is gentle.

Can Otocinclus live with shrimp?

Adult shrimp: usually fine. Baby shrimp: usually fine.

Is Otocinclus a good fish for beginners?

Beginner level 3/5. A mature, cycled aquarium is preferred. Activity: moderate; waste: low.