Otocinclus Catfish

The Otocinclus, often called the “Otto”, is a small, peaceful algae-eating fish that is a must-have for planted and community aquariums. Known for its gentle nature and tireless grazing, this tiny catfish plays an important role in keeping your tank clean, balanced, and visually pristine.

With its subtle colouring and active behaviour, the Otocinclus adds life to the lower and mid-levels of your aquarium without disturbing other tank inhabitants.

Why You’ll Love Them

• Algae Control Experts: Constantly graze on soft algae and biofilm
• Peaceful Nature: Perfect for shrimp tanks and community setups
• Small & Subtle: Ideal for nano and planted aquariums
• Group Behaviour: Active and more confident when kept in groups

Care Requirements

Otocinclus are sensitive fish and thrive best in stable, mature aquariums.

• Tank Size: 40L+ recommended
• Temperature: 22–26°C
• pH: 6.0–7.5
• Diet: Algae, biofilm, algae wafers, and blanched vegetables

👉 Best kept in groups of 5 or more
👉 Require established tanks with natural algae growth

Behaviour & Compatibility

• Extremely peaceful and non-aggressive
• Ideal with small, calm fish and shrimp
• Should not be kept with aggressive or highly active species

Aquascaping Notes

Otocinclus thrive in heavily planted aquascapes with driftwood, soft lighting, and natural algae growth. Their subtle colour allows them to blend beautifully into natural layouts while quietly maintaining cleanliness.

Expert Insight

Otocinclus are best introduced into established aquariums, as they rely heavily on naturally occurring biofilm. While delicate at first, they become hardy and highly effective algae grazers once settled.

At The Glass and Gill – Aquascape, we provide healthy, carefully acclimated Otocinclus to help you maintain a clean, balanced, and thriving aquarium—naturally.