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Species profile

Common Otocinclus

Otocinclus vittatus

Common names: Common Otocinclus, Oto, Dwarf Sucker

Recognized speciesCatfish

Adult size

Up to 4.5 cm

Up to 4.5 cm

Countries of origin

  • See all stock from Bolivia
  • See all stock from Brazil
  • See all stock from Paraguay

Good fit for your tank?

Good fit for

  • A peaceful community tank with similar-sized fish
  • A small, well-kept nano tank
  • A mature, stable aquarium

Think carefully if

  • You only want to keep one or two, because this fish needs a group of 6 or more
  • Your tank is newly set up

One of the most popular small algae-grazers, a tiny, peaceful fish with a dark stripe from nose to tail. Keep a group of at least 6 in 40 litres or more.

Appearance and Identification

One of the most popular small algae-grazers, a tiny, peaceful fish with a dark stripe from nose to tail. Most are wild-caught, because they are hard to breed, so they often arrive thin. Add them only to a mature tank with plenty of algae.

Check the scientific name when buying, as common names vary between sellers and countries.

Females are usually larger and rounder.

Tank Requirements

Suggested filter
About 160–200 litres an hour
Suggested heater
About 50–75 W for this tank
Minimum tank volume
40 litres
Minimum tank length
45 cm
Minimum group size
6
Recommended group size
8
Activity level
Moderate
Flow preference
Low to moderate
Planting preference
Heavily planted
Hiding places
Yes
Lid recommended
Yes
Jumping risk
Moderate

Add it only to a mature, planted tank with plenty of soft algae and biofilm. Wild fish often arrive thin and delicate, so check that they are feeding before you buy them.

Behaviour and Tankmates

A small, peaceful grazer that spends its time on leaves, wood and glass.

Keep a group of at least 6.

Not territorial.

Ideal for peaceful planted tanks and safe with shrimp. Larger fish can intimidate it.

Check tankmates for this species

Water Parameters

Temperature
21–26 °C
pH
6–7.5
GH
2–12
Stability importance
Very important

Fairly tolerant of different water, if it is clean and stable.

Parameter caveat
Add this fish only to a mature, fully cycled tank, and keep up regular water changes.

Feeding

Diet types
Algae Grazer, Herbivore
Feeding frequency
Daily
Preferred foods
  • Spirulina or algae wafersShould make up much of the diet.
  • Blanched vegetablesCourgette, cucumber and peas work well. Remove leftovers within a day.
  • Small frozen foodsAn occasional addition for protein.

Grazes on soft algae and biofilm. Supplement with algae wafers and blanched vegetables.

Feed small amounts, and remove anything left after a few minutes.

Breeding

Breeding type
Egg Scatterer
Breeding difficulty
Moderate
Parental care
None
Baby foods
  • InfusoriaNeeded for the first days, because most fry are very small.
  • Newly hatched brine shrimpIntroduce as soon as the fry can take it.

An egg scatterer with no parental care. Adults eat eggs and fry, so use a separate tank with fine plants, moss or mesh on the bottom, and remove the adults after spawning. The fry need very small foods at first.

Habitat and Origin

Geographic origin
Bolivia, Brazil, Paraguay, South America
Natural habitat
River
Aquarium contexts
Nano Aquarium, Planted Aquarium
Audience level
Intermediate

Classification

Profile type
Recognized species
Genus
Otocinclus
Family
Loricariidae
Species group
Catfish, Fish, Otocinclus

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