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Otocinclus catfish, often called “Otos,” are known as some of the best algae-eating fish for freshwater aquariums. Native to South American rivers, these small catfish are prized for grazing algae off glass, plants, and decorations—making them an essential part of any tank’s cleanup crew. They have distinctive black markings and a mottled appearance, easily standing out among nano fish.
Otocinclus have a reputation for being sensitive, mainly due to their need for consistent food and gut bacteria. They are constant grazers and need a steady food supply to maintain digestive health. At Flip Aquatics, we supplement their diet with Bacter AE and ShrimpFit and quarantine new arrivals for at least two weeks. When properly cared for, Otocinclus are beginner-friendly and easy to keep.
A balanced diet is key for Otocinclus. We feed ours the following:
This variety ensures proper nutrition, especially when natural algae is limited.
All Otocinclus Catfish orders are backed by our 100% Live Arrival Guarantee. We use proven shipping methods to ensure your fish arrive healthy. If any issues arise, simply provide photos and we’ll refund or replace your fish. Orders may take up to a week to ship based on availability.
We recommend a minimum tank size of 5 gallons, but 10+ gallons is ideal for keeping Otocinclus in groups of 3 or more. Stable water conditions, especially during the first week, are crucial. They do best in mature aquariums with established algae and biofilm, along with plenty of cover from plants, driftwood, and rocks.
They do best in groups of 3 or more to reduce stress and promote natural behavior. Otos are peaceful and enjoy being part of a small school.
Yes, they are excellent at eating soft green algae and diatoms. They graze constantly and are especially known for cleaning glass and hard surfaces.
Yes, Otocinclus are peaceful and safe with shrimp, snails, and other non-aggressive fish. We’ve never seen them harm shrimp—even baby shrimp.
Arrived healthy!
Arrived nice and healthy; they are working very hard on the brown algae in my aquarium
Cool little fish. Showed up in good health and now I have 3 of them and they are always together from playing in the bubbles to chillen on the glass fun to watch.
Perfect
He came healthy but shy. He has lots of food to eat and getting a bit chunky 🤣
