Common Otocinclus

Care requirements

Care level: Intermediate.

Because it uses the lower to middle part of the aquarium, leave enough open substrate area instead of crowding that part of the aquarium.

The listed lifespan is 3–5 years.

Aquarium size and space needs

An aquarium of 75 L or larger / ≥ 60 cm (≥ 23.6 in) minimum length can be a reasonable starting point, but it should not be read as permission to overstock.

Water parameters

The temperature range for this fish is 21–26 °C. Compare it carefully with the aquarium target temperature instead of assuming every tropical community setup is suitable.

The pH range for this fish is 5.5–7.5. That points to acidic to neutral water, but stability is more important than sudden corrections.

The GH range for this fish is 2–12 dGH. That gives some flexibility, but sudden changes are usually more stressful than a stable value that is slightly imperfect.

The KH range is 0–8 dKH. Use it as a general stability reference rather than a reason for aggressive adjustments.

Temperament and compatibility

As a peaceful bottom-to-middle swimmer, Common Otocinclus is best kept with calm species that will not harass it or dominate the feeding area.

Because this fish uses the lower to middle part of the aquarium, compatibility is easier when other fish are not all competing for the same swimming space.

Plant safe

Yes

Shrimp safe

Yes

Snail safe

Yes

Community safe

Yes

Aquascape fit

Yes

Swimming zone and behavior

This fish uses the lower to middle part of the aquarium, so leave enough open substrate area for movement and feeding.

Feeding

As an omnivore, Common Otocinclus should receive a varied diet rather than one repeated food type.

Because it feeds near the bottom, make sure food reaches the substrate and is not completely taken by faster fish in the open water.

Provide mature biofilm plus spirulina foods, algae wafers, vegetables and occasional small protein-rich foods. Monitor belly condition.

Natural habitat and origin

Origin: Central South American river basins.

Natural habitat: Vegetated streams and river margins where groups graze biofilm, algae and microorganisms from plants, wood and other submerged surfaces.

Breeding notes

Breeding difficulty is currently recorded as Intermediate - Advanced, so breeding plans should be researched beyond the basic care profile.

Adult size is about 3–4 cm. The greatest husbandry risk is starvation in a sterile or aggressively cleaned aquarium rather than a lack of nuisance algae.

Before adding this fish

• Plan for an aquarium of 75 L or larger / ≥ 60 cm (≥ 23.6 in) minimum length.
• Make sure the bottom area has enough open substrate for a group.
• Choose other fish with overlapping temperature needs.
• Keep pH stable within the listed range instead of making sudden corrections.
• Avoid aggressive or highly competitive fish.
• Offer a varied diet suitable for an omnivorous bottom-dwelling fish.