Common pleco

Overview

The common pleco is the little "sucker fish" sold at 2 in (5 cm) in big-box stores, and one of the most regretted purchases in the hobby. What is sold under this name is usually Pterygoplichthys pardalis or a close relative, an Amazon-basin loricariid that easily reaches 14-18 in (35-45 cm) in aquariums and can live well over 15 years.

It is an impressive animal: armored body with a leopard pattern, a tall sail-like dorsal fin and a big sucker mouth. It is hardy and fairly calm, but its size and heavy waste output make it suitable only for very large tanks. Released plecos have become invasive in Florida, Texas, Mexico and parts of Asia, where they burrow into riverbanks and damage ecosystems.

Care and tank setup

Let's be honest: an adult common pleco needs at least 125-150 gallons (500+ L) and a tank around 6 ft (180 cm) long. In a 10- or 30-gallon tank it is stunted, pollutes the water and lives poorly. Before buying one, ask yourself where it will live at 16 inches; for an average community tank, a bristlenose is the right choice.

• Very powerful filtration (a large canister or several filters) and big water changes.
• Large driftwood and roomy caves, set firmly so it cannot topple them.
• Tough plants tied to wood or rock; it uproots anything loose.

It is usually calm with other fish, but adults defend territory against other bottom dwellers and may rasp the slime coat of slow, flat-bodied fish such as angelfish or discus at night. If you can no longer keep it, rehome it through a store or local club. Never release it into the wild.

Feeding

It is an omnivore that leans herbivore and eats a lot. Offer large sinking algae wafers, blanched vegetables (zucchini, cucumber, sweet potato, peas) and an occasional protein food. Driftwood adds fibre. An adult eats heavily and produces a matching amount of waste, so portion carefully and remove leftovers to keep nitrates down.

Breeding

In the wild it digs burrows into muddy banks, where the male guards the eggs. That cannot be replicated in a home aquarium: the fish in stores come from outdoor pond farms in Asia and Florida. It is not a species you will breed at home, and its ability to reproduce in warm rivers is exactly what made it invasive.

Compatible tank mates

Species from our database that share water parameters, size and temperament with the Common pleco. Calculated from the data in each profile.

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Recommended equipment

What you need to keep the Common pleco healthy, checked against Amazon stock.