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Otocinclus tank mates

Otocinclus tank mates should live in a mature, algae-rich planted tank — not a sterile new setup. Peaceful schoolers are fine; large cichlids and hungry midwater fish outcompete them at lights-out. Buy a group, quarantine carefully, and do not expect them to replace a bristlenose on a dirty glass problem overnight.

Common mistakeAdding otocinclus to a tank under two months old because the glass looks green is the classic starvation buy. There is not enough biofilm yet, and they waste away while the keeper blames “weak stock.” Cycle and mature the tank first, then add a group of four or more with a backup wafer habit.

Evidence: verified
Confidence: high

Each name below opens a pair check with Otocinclus. That check is the decision, not the list itself.

← Full Otocinclus profile·Compatibility checker·Tank builder·More algae-eater

Usually safer companions

Conservative shortlist from this profile. Open a pair page before you buy.

  • Cherry BarbPair check

    The Otocinclus profile lists Cherry Barb as both safe and a recommended pairing. Cherry Barb schools in groups of 6 or more, so plan room for the whole group rather than one fish.

  • Corydoras CatfishPair check

    The Otocinclus profile lists Corydoras Catfish as both safe and a recommended pairing. Corydoras Catfish schools in groups of 6 or more, so plan room for the whole group rather than one fish.

  • Neon TetraPair check

    The Otocinclus profile lists Neon Tetra as both safe and a recommended pairing. Neon Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish.

Risky or situational

May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.

  • GuppyOpen pair check

    Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.

  • Tiger BarbOpen pair check

    Tiger Barb is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Otocinclus. Run the pair checker before stocking.

Fish to avoid with Otocinclus

Predation, aggression, or space rules on this profile. Treat these as poor default mixes.

  • Jack DempseySee why (pair)

    Jack Dempsey reaches 25cm and is flagged predatory. Otocinclus at 5cm is prey-sized for it. Jack Dempsey needs at least 200L, far above the 60L minimum for Otocinclus. The tank that houses one stresses the other. Jack Dempsey is rated aggressive and Otocinclus is rated peaceful. No community-style planning carries that gap.

  • OscarSee why (pair)

    Oscar reaches 35cm and is flagged predatory. Otocinclus at 5cm is prey-sized for it. Oscar needs at least 300L, far above the 60L minimum for Otocinclus. The tank that houses one stresses the other. Oscar is rated aggressive and Otocinclus is rated peaceful. No community-style planning carries that gap.

Tank size and groups

  • Published minimum for Otocinclus: 60L. Group minimum 6 (schooling).
  • Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
  • Nearest litre hub to this minimum: 60L hub.

Easier alternatives to consider

Hardier first-tank names from the library. Still read the profile. Not a substitute for reading this one.

Plan before you buy

Start a pair check with Otocinclus, or open a starter plan with the top safer companions in the builder.

Open pair checkerOpen this plan in builder

Tank hubs: 60L

Related reading

Guides that list other fish with the same trait, so you can plan around the group rather than one row.

Filtration & heating

A 60L minimum tank for Otocinclus needs a filter rated for at least 240L/hr turnover and a heater maintaining 20–27°C.

Filter size guide →Heater size guide →Tank setup checklist →Beginner plants guide →

Similar fish (same category)

Related (care + temperament)

Other species that list Otocinclus

Reverse lookup: these profiles reference Otocinclus under safe or “best with” lists.

Featured compatibility checks

Curated pair pages for Otocinclus. Each opens a full verdict — not just a list label.

Otocinclus tank mates — quick answers

What fish can live with Otocinclus?
Usually safer companions on this hub include Cherry Barb, Corydoras Catfish, Neon Tetra. Open each pair check before you buy — the list is a shortlist, not a guarantee.
What tank mates should you avoid with Otocinclus?
Avoid Jack Dempsey, Oscar based on size, temperament, or predation risk on this profile.
What size tank do Otocinclus need for a community?
60L+ for a group of 6+; otos are social and decline kept solo.