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Common Pleco
Hypostomus plecostomus
Animalia›Chordata›Actinopterygii›Loricariidae
📍 Amazon & Orinoco Basins, South America
The common pleco is one of the most recognisable aquarium fish, widely sold for algae control. It grows very large and requires a spacious tank as an adult. Despite its popularity it is often impulse-bought for tanks far too small to sustain it long-term.
Care Guide
Diet
Common plecos are primarily herbivorous and should be fed high-quality algae wafers, blanched vegetables (zucchini, cucumber, spinach), and sinking pellets 3-4 times weekly. They will consume algae naturally in the tank but require supplemental feeding as they grow larger. Occasional protein sources like bloodworms or shrimp pellets can be offered, but vegetables should comprise the majority of their diet.
Behavior
Common plecos are nocturnal bottom-dwellers that spend most daylight hours hiding in caves, under driftwood, or behind plants. They are generally peaceful but become increasingly territorial toward other plecos as they mature, especially in smaller tanks. These fish are primarily solitary and can live alone without issue; they rarely interact with other species except during feeding.
Breeding
Breeding common plecos in captivity is extremely difficult and rarely successful in home aquariums. They require very large tanks (200+ gallons), specific cave structures for spawning, and precise water conditions that are difficult to replicate. Most plecos sold in the aquarium trade are wild-caught or bred in specialized commercial facilities.
Tank Mates
Small schooling fish that occupy mid-water column and won't compete for bottom space or food
Similar water parameter requirements and peaceful nature; occupy different tank zones
Schooling fish that prefer mid-water areas, leaving bottom territory for the pleco
Can coexist if tank is very large (150+ gallons) with multiple hiding spots, but territorial aggression possible
Algae-eating invertebrates that work alongside plecos without direct competition
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, lethargy, rubbing against surfaces
Raise temperature gradually to 28-30°C, perform 25% water changes daily, use aquarium salt (1 tsp per 5 gallons) or commercial ich treatment; maintain for 10-14 days
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, lethargy
Perform 50% water change immediately, improve water quality, add aquarium salt or antibacterial medication; ensure adequate hiding spots to reduce stress
Bacterial Infection
Open sores, cloudy patches on skin, loss of appetite, behavioral changes
Increase water changes to 50% every 2-3 days, use broad-spectrum antibiotic treatment, ensure excellent water quality and proper nutrition
Malnutrition/Stunted Growth
Slow growth despite adequate tank size, lethargy, pale coloration, reduced appetite
Provide varied diet with quality algae wafers, fresh vegetables daily, and occasional protein; ensure tank is not overcrowded and water parameters are stable
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Quick Facts
- diet
- Herbivore/Omnivore – algae wafers, vegetables, driftwood, sinking pellets
- lifespan
- 10–15 years
- max size
- 50 cm (20 in)
- tank size
- 100 gallons minimum for adults
- temperament
- Peaceful; territorial toward own kind
Water it likes
- ph
- 6.5–7.5
- ammonia
- 0 ppm
- nitrate
- <30 ppm
- hardness
- 5–15 dGH
- temperature
- 72–82°F (22–28°C)