Common pleco care guide
Also called: Plecostomus, Suckermouth catfish, Amazon sailfin catfish, Janitor fish
The common pleco is the armored sucker catfish sold as a small algae eater, but it grows to 12–18 inches (30–45 cm) or more. An adult needs a tank of at least 150 gallons (570 L) and 6 ft (180 cm) long, so it suits very few home aquariums.
Common plecos need a tank of at least 150 gallons (568 L), and water at 23–28°C (73–82°F) with a pH of 6.5–7.5. They grow to about 40 cm (15.7 in) and are peaceful.
Plan a tank with common plecosSee all tank mates
Common pleco quick facts
| Scientific name | Pterygoplichthys pardalis |
|---|---|
| Family | Loricariidae |
| Origin | Amazon basin, South America (most in shops are farm-bred) |
| Adult size | 40 cm (15.7 in) |
| Minimum tank | 150 gallons (568 L), at least 180 cm (71 in) long |
| Temperature | 23–28°C (73–82°F) |
| pH | 6.5–7.5 |
| Hardness (GH) | 4–20 dGH |
| Group size | Can live alone |
| Temperament | Peaceful; fights its own kind |
| Swims at | Bottom |
| Diet | Herbivore (mostly plants and algae) |
| Care level | Moderate |
| Lifespan | 10–20 years |
| Safe with shrimp? | Mostly (eats baby shrimp) |
| Safe with plants? | No, eats or uproots plants |
Tank setup
Babies are sold at a few inches, but an adult needs at least a 150-gallon (570 L) tank that is 6 ft (180 cm) long, and bigger is better. Provide large driftwood, wide caves and smooth rocks, and make sure decor can't be knocked over. Strong filtration is a must because it makes a lot of waste.
How many common plecos in a tank?
Common plecos need a very large tank: at least 150 gallons (568 L).
| Tank | Common plecos (alone) |
|---|---|
| 3 gallon | Too small |
| 5 gallon | Too small |
| 10 gallon | Too small |
| 15 gallon | Too small |
| 20 gallon | Too small |
| 20 gallon long | Too small |
| 29 gallon | Too small |
| 40 gallon | Too small |
| 55 gallon | Too small |
| 75 gallon | Too small |
| 125 gallon | Too small |
Numbers are bioload limits only. Keep only one per tank.
What you need for common plecos
Sized for a 155 gallon tank, the smallest common size that suits common plecos. For a different tank or a mix of fish, use the stocking calculator for a list sized to your plan.
Tank and equipment
- 155 gallon aquarium (tank or kit) (opens Amazon in a new tab)Bigger tanks are more stable and easier for beginners. How to choose
- Aquarium stand for 155 gallons (opens Amazon in a new tab)The water alone weighs about 1293 lb (587 kg), before glass, gravel and rock. How to choose
- 2 adjustable heaters, 300 W each (opens Amazon in a new tab)Holds about 78 °F (25.5 °C) in a room at 65 °F (18 °C). Two heaters keep the tank warm if one fails. How to choose
- Aquarium thermometer (opens Amazon in a new tab)Check it daily: heaters can fail stuck on or off. How to choose
- Canister filter rated 930–1550 GPH (opens Amazon in a new tab)Heavily stocked or messy fish: 6–10 times the tank volume per hour. How to choose
- About 200 lb of aquarium gravel (opens Amazon in a new tab)Enough for a layer about 2 in (5 cm) deep. Smooth gravel suits most community fish. How to choose
- Water conditioner (dechlorinator) (opens Amazon in a new tab)Removes chlorine and chloramine from tap water. Seachem Prime is a popular, concentrated choice. How to choose
- Liquid test kit (ammonia, nitrite, nitrate, pH) (opens Amazon in a new tab)Liquid kits are more accurate than strips. The API Freshwater Master Test Kit is the common choice. How to choose
- Gravel vacuum (siphon) (opens Amazon in a new tab)Cleans the gravel and does the water change in one go. How to choose
- LED aquarium light, about 83 in long (opens Amazon in a new tab)Match the light to the tank length. Basic LEDs grow easy plants. How to choose
Food and extras for common plecos
- Algae wafers (opens Amazon in a new tab)Sinking food for plecos, otocinclus and other grazers. How to choose
- Aquarium driftwood (opens Amazon in a new tab)Plecos graze on it, and it softens water slightly.
- Caves and hides (opens Amazon in a new tab)Gives shy and territorial fish their own space.
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Water parameters
Keep it at 23–28°C (73–82°F), pH 6.5–7.5 and soft to fairly hard water. It is hardy and adaptable, but its heavy waste raises nitrate fast. Large weekly water changes and an oversized filter keep the water clean.
Best tank mates for common plecos
These popular species share common plecos' water needs and temperament. See the full list of 90 good matches.
Betta fish
6.5 cm (2.6 in) · 24–28°C (75–82°F)
Cherry shrimp
3 cm (1.2 in) · 20–27°C (68–81°F)
Nerite snail
2.5 cm (1 in) · 22–27°C (72–81°F)
Guppy
5 cm (2 in) · 22–27°C (72–81°F)
Dwarf gourami
7.5 cm (3 in) · 24–28°C (75–82°F)
Neon tetra
3.5 cm (1.4 in) · 21–25°C (70–77°F)
Zebra danio
5 cm (2 in) · 18–25°C (64–77°F)
Angelfish
15 cm (5.9 in) · 24–29°C (75–84°F)
Avoid keeping common plecos with
- Common goldfish: They need different temperatures: Common pleco 23–28°C (73–82°F), common goldfish 15–22°C (59–72°F).
- Chinese algae eater: Chinese algae eater is aggressive and will bully or injure peaceful common plecos.
- Convict cichlid: Convict cichlid is aggressive and will bully or injure peaceful common plecos.
- Jack Dempsey: Jack Dempsey is aggressive and will bully or injure peaceful common plecos.
- Pea puffer: Pea puffer is aggressive and will bully or injure peaceful common plecos.
- Red zebra cichlid: Red zebra cichlid is aggressive and will bully or injure peaceful common plecos.
Feeding
Mainly a grazer of algae, plant matter and detritus, and adults eat less algae than young fish. Feed sinking algae wafers or pellets plus vegetables like zucchini, cucumber, peas and sweet potato. Offer some meaty food such as shrimp or bloodworms now and then, and keep driftwood in the tank to rasp.
Behavior
Peaceful toward most fish and mostly active at night. Adults turn territorial toward other plecos and large bottom fish, so keep only one. A hungry pleco may rasp the slime coat of slow, flat-bodied fish like discus, angelfish or goldfish while they rest. Larger, robust fish make the best tankmates.
Breeding
Not bred in home aquariums. In the wild they spawn in burrows dug into muddy banks, which a normal tank can't copy. Fish in shops are raised in outdoor farm ponds. Several similar species, including Hypostomus plecostomus and other Pterygoplichthys, are sold under the same name and need the same care.
Tips from experienced keepers
- Plan for the adult size before you buy. The cute 3-inch baby turns into a foot-long fish.
- Never release a pleco into ponds, lakes or rivers. It is an invasive pest in many warm countries.
- Don't rely on it to clean algae. Adults need wafers, vegetables and driftwood every day.
- Keep only one per tank. Adults fight other plecos over caves and food.
- If it outgrows your tank, ask a local fish store, club or public aquarium to rehome it.
Frequently asked questions
How big does a common pleco get?
In aquariums most reach 12–18 inches (30–45 cm), and some get close to 2 feet (60 cm). It grows quickly when well fed.
What size tank does a common pleco need?
Plan on at least 150 gallons (570 L) and 6 ft (180 cm) of length for an adult. A young one can start in a smaller tank, but it will outgrow a 55- or 75-gallon tank.
Will a common pleco eat my other fish?
No, it doesn't hunt fish. But a hungry adult may rasp the slime coat off slow, flat fish at night, and it can bully other bottom-dwellers.
Sources
We checked these references when writing this page. Values are for healthy long-term keeping, not survival limits. Last reviewed 2026-10-13. See our editorial policy.