Zebra Otocinclus

Meet the Zebra Otocinclus (Otocinclus cocama), a small freshwater suckermouth catfish native to Peru. Its distinctive dark vertical markings make it a striking grazer for a peaceful, established planted aquarium. This is a specialist fish with ongoing feeding needs, not a maintenance-free solution to algae.

Adult size and care

Adults reach approximately 1.7–1.8 inches (4.4–4.5 cm) in standard length, measured without the tail fin. Aim for stable water at 70–77°F (21–25°C), pH 6.0–7.5, and soft to moderately hard water around 2–10 dGH. Provide gentle filtration, good oxygenation, plants, wood, smooth rocks, and sheltered resting areas.

A mature aquarium is essential

Add Zebra Otocinclus only to a fully cycled, well-established aquarium with abundant biofilm and soft algae on plants and other surfaces. A newly cycled or freshly scrubbed tank may not provide enough food. Preserve grazing surfaces and maintain consistently clean, stable water.

Diet and feeding

Natural biofilm, soft green algae, and diatoms are important grazing foods. Supplement with algae- or spirulina-based sinking foods and small portions of blanched zucchini or spinach. Newly introduced fish may not immediately recognize prepared foods, so do not rely on wafers alone. Check that every fish is feeding and maintaining a gently rounded belly, and remove uneaten food before it affects water quality.

Group size

Keep a group of at least six Zebra Otocinclus, with enough space and mature grazing surfaces to support the entire group. These social, timid fish are more comfortable with their own kind. Plan for their food supply as carefully as their swimming space.

Compatible tankmates

Choose small, calm companions with compatible water requirements, such as peaceful small tetras, smaller peaceful catfish, and dwarf freshwater shrimp. A quiet species-focused setup is also a good option. Avoid large, aggressive, or boisterous fish that may intimidate them, compete heavily for food, or view them as prey.

Before ordering and on arrival

Have a mature aquarium ready before ordering and arrange to receive the shipment promptly. Review the store's current shipping and live-arrival terms before purchase for dispatch timing, delivery coverage, and any claim requirements. After arrival, follow the supplied acclimation guidance and closely monitor feeding as the fish settle in.

Representative photo

Photos are representative examples of the species, not the exact fish you will receive. Individual markings, coloration, and size vary, and coloration may appear subdued during transport and acclimation. Adult size listed above is not a shipping-size guarantee.