Undecimalis-Pterygoplichthys - (Pterygoplichthys undecimalis)

🐟 Undecimalis Pleco – (Pterygoplichthys undecimalis) – Large South American Algae-Eating Pleco

The Undecimalis Pleco (Pterygoplichthys undecimalis) is a large, hardy freshwater pleco species native to rivers and floodplain systems of South America. Known for its tall dorsal fin with 11 or more rays, striking reticulated pattern, and strong algae-grazing ability, this species is both beautiful and functional in large aquariums or ponds. As a member of the Pterygoplichthys genus, it grows significantly larger than common Ancistrus species, making it best suited for experienced aquarists with spacious setups.

🔎 Quick Facts – Undecimalis Pleco (Pterygoplichthys undecimalis)

• 📛 Common Name: Undecimalis Pleco
• 🔬 Scientific Name: Pterygoplichthys undecimalis
• 🌍 Origin: South America – Amazon and Orinoco River Basins
• 🎨 Appearance: Dark body with lighter reticulated pattern; tall dorsal fin with 11+ rays
• 📏 Max Size: 18–20 inches (45–50 cm)
• 💎 Availability: Occasionally available; valued for algae control and unique markings

😇 Behavior & Temperament

• 🤝 Peaceful, compatible with most medium-to-large tankmates
• 🪵 Requires plenty of space for movement
• 🌿 Strong algae grazer but also needs supplemental feeding

🏠 Aquarium & Tank Requirements

• 📦 Minimum Tank Size: 125+ gallons
• 🪵 Provide driftwood, large rocks, and hiding spots
• 🌊 Strong filtration to handle heavy bio-load
• 💡 Moderate lighting to encourage algae growth for grazing

💧 Water Parameters – Undecimalis Pleco Care

• 🌡️ Temperature: 74–82°F (23–28°C)
• ⚗️ pH: 6.5–7.8
• 💧 Hardness: Soft to moderately hard water

🍽️ Diet – Omnivorous with Herbivorous Preference

• 🌿 Algae wafers and fresh vegetables (zucchini, cucumber, spinach)
• 🐟 Occasional protein foods such as shrimp or bloodworms
• 🪵 Benefits from driftwood as part of natural diet

📋 Undecimalis Pleco Overview Table

✨ Highlight:
The Undecimalis Pleco is a large, peaceful algae-eating pleco with bold reticulated markings and an impressive dorsal fin — ideal for spacious aquariums or ponds needing both beauty and algae control.