Common Pleco
Pterygoplichthys pardalis
Loricariidae
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About
The common pleco is the 6 cm suckermouth catfish sold as an algae cleaner that grows into a 55 cm armoured animal with a waste output no ordinary aquarium can absorb. Shop fish are usually Pterygoplichthys pardalis, the Amazon sailfin catfish, although several near-identical Pterygoplichthys species and various Hypostomus travel under the same name, so you rarely know exactly what is in the bag. Adults mostly stop eating algae, need large amounts of vegetable food, uproot and rasp plants, and will strip the slime coat from slow, flat-sided tankmates such as discus and angelfish. Aquarium Co-Op puts the starting tank at 75 gallons and the adult tank at 180 gallons or more.
Care
Plan for a 55 cm adult: 680 L over a 180 cm footprint as the honest minimum, heavily oversized filtration, large weekly water changes and driftwood to rasp. Feed vegetables and sinking wafers rather than relying on algae, keep one per tank, and never pair it with slow, flat-bodied fish it can rasp.
Diet
Herbivore and detritivore. Blanched vegetables, sinking algae and spirulina wafers, and driftwood; the algae-eating reputation fades completely with size.
Tankmate compatibility
Avoid (271)
Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.
Telling males from females
What works for this species, most reliable first.
- Bristles and cheek spinesStrong · from about a year
Male plecos grow odontodes — spiny growths on the cheeks and along the leading pectoral rays. Bristlenose males additionally grow branching tentacles across the snout and over the top of the head.
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Frequently asked questions
- What tank size does a Common Pleco need?
- A Common Pleco needs an aquarium of at least 680 litres (179.6 US gallons) with a footprint at least 180 cm (70.9 in) long — for this species, swimming length matters as much as raw volume.
- What water parameters does a Common Pleco need?
- Common Pleco does best at 23–28 °C (73.4–82.4 °F), pH 6.5–7.8 and a general hardness of 4–20 °dGH.
- Is the Common Pleco suitable for beginners?
- Common Pleco sits in the middle of the difficulty scale — manageable for a careful beginner who has done the reading, but it has specific needs worth researching first.