Otocinclus Care Sheet
IntermediateOtocinclus affinis · fish
Otocinclus are small, peaceful catfish that are excellent algae eaters for planted aquariums. They require stable water conditions and a group of at least 6 to thrive.
Quick care stats
Adult size1.5-2 inches
Lifespan3-5 years
Min tank size10 gallons
Water temp72-78°F
pH6.5-7.5
Hardness5-12 dGH
Temperamentpeaceful
Group / schoolinggroup of 6+
Tank matesSmall peaceful fish such as tetras, rasboras, and dwarf cichlids.
DietPrimarily herbivorous; feed algae wafers, blanched vegetables (zucchini, spinach), and ensure natural algae growth. Feed once daily, small amounts.
What you need (full setup)
🔧 Tank (10+ gallons)Provides adequate swimming space and stable environment for a group.🔧 Filter (sponge or canister)Gentle flow and biological filtration; sponge filter avoids sucking up small fish.🔧 Adjustable heaterMaintains stable temperature within 72-78°F.🔧 ThermometerMonitors temperature to prevent fluctuations.🔧 Substrate (sand or fine gravel)Soft substrate protects sensitive barbels and allows foraging.🔧 Water conditionerRemoves chlorine, chloramine, and heavy metals from tap water.🔧 Test kit (liquid)Tracks ammonia, nitrite, nitrate, pH to ensure water quality.🔧 Live plants and driftwoodProvides biofilm and algae grazing surfaces; plants improve water quality.
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Common health issues
- Stress from small groups
- Starvation if insufficient algae
- Sensitivity to poor water quality
- Difficulty acclimating to new tanks
⚠️ For any sign of illness (not eating, lethargy, swelling, retained shed), see a qualified exotics vet. Care sheets are general guidance only.