Albino Sailfin Pleco L021 (Pterygoplichthys pardalis)

Meet the Albino Sailfin Pleco

The Albino Sailfin Pleco is a pale, red-eyed form of Pterygoplichthys pardalis, the Amazon sailfin catfish. In place of the dark leopard spots of the wild fish, its body is creamy gold to apricot, with a faint net of orange markings on the head and armour plates, and its tall, sail-like dorsal fin carries many golden rays. It is a striking fish for a big display aquarium, but it is also one of the largest plecos in the trade, and the most important fact on this page is its adult size: 40–50 cm or more.

The species was described by Castelnau in 1855 from the Amazon River in Brazil, and lives across the lower, middle and upper Amazon basin. ScotCat records that albino forms first reached the UK in the early 1990s from breeding programmes in the Czech Republic, and that the fish is now bred in fish farms in the Far East and in Florida. The albino form comes from these breeding programmes, so the fish on sale are farm-bred.

Check the names and codes

You can compare it with the other big sailfins in our Pterygoplichthys plecos, our L-number plecos, the wider South American catfish category and the full catfish and plecos range.

Tell a sailfin from other plecos

Planet Catfish gives a simple test: Pterygoplichthys have ten or more rays in the dorsal fin, while most other plecos, including the large Hypostomus sold as the Common Pleco, have eight or fewer. Among the sailfins, P. pardalis is most easily confused with P. disjunctivus: Planet Catfish says the belly is spotted in P. pardalis and vermiculated (wormy-lined) in P. disjunctivus. Our Gold Sailfin Pleco and Leopard Sailfin Pleco are a different species again, P. gibbiceps, which Planet Catfish names after the hump on its head; ScotCat notes that P. pardalis lacks that hump.

Read this before you buy: it grows past 40 cm

Planet Catfish gives a size of 423 mm standard length (body without the tail), ScotCat 50 cm, Practical Fishkeeping over 50 cm, and FishBase a maximum of 57.8 cm total length. Practical Fishkeeping describes 5 cm plecs bought for small tanks reaching 20 cm "all too frequently and quickly", and owners then struggling to cope. ScotCat puts it plainly: it grows too large for the majority of home aquariums.

The fish on this listing is 5–6 cm, the size at which most people underestimate it. Buy it only if you can give it a very large aquarium for the whole of its life.

Answer three questions honestly

• Space: can you house an aquarium of 180 cm or more and over 500 litres within the next year or two?
• Filtration: can you run heavy external filtration and change a quarter of that volume every week?
• Commitment: are you ready to keep a large, long-lived fish rather than pass it on when it outgrows the tank?

If the answer to any of these is no, a Bristlenose Pleco gives you a suckermouth catfish that stays a manageable size; Practical Fishkeeping recommends Ancistrus and other small grazers as better choices for ordinary aquariums.

Know what one purchase supplies

One purchase supplies one live, farm-bred Albino Sailfin Pleco of 5–6 cm. Sex is not specified: Planet Catfish says males and females can be told apart only by the shape of the genital papilla in mature fish, which takes a trained eye. The photographs show the form, not the individual you will receive; the depth of the gold and apricot tones and the faint head pattern vary from fish to fish.

Plan from the adult, not the sale size

• Adult length: 42–58 cm depending on the source and the measurement.
• Aquarium: over 500 litres (OATA), 180 cm or longer (ScotCat).
• Temperature: about 25–26°C.
• Filtration: heavy-duty external filters.
• Food: vegetables and sinking foods every day.
• Company: large, robust fish only.

Read our delivery and Live Arrival Guarantee information before ordering and have the aquarium mature and at temperature.

Plan a 180 cm, 500-litre home

OATA's guidance on very large fish says adults usually need an aquarium in excess of 500 litres, and lists larger pleco species among them. ScotCat gives a tank of 6 ft (180 cm) or over, and Practical Fishkeeping says adults need tanks of many hundreds of litres. OATA accepts that small juveniles can start in smaller tanks, but warns that many grow quickly, so the large tank should be planned, and ideally running, before the youngster outgrows its first home. Our tank volume calculator works out what your aquarium really holds.

Use a three-step space check

1. Measure the final tank: 180 cm long or more, with enough depth for a 50 cm fish to turn easily.
2. Check the volume: over 500 litres once décor and substrate are allowed for.
3. Check the stand and floor: a tank of that size is very heavy, so make sure both can carry it.

Keep décor simple and solid

Practical Fishkeeping recommends bogwood, rocks and ceramic or plastic pipes for shelter, with the décor kept simple, and Planet Catfish says large plastic or ceramic pipes make the best hiding places. Planet Catfish adds that larger fish will uproot plants without meaning to. OATA's advice for very large fish is to secure rocks and ornaments so they cannot be knocked over, to protect heaters from damage and to fit a fish-proof cover.

Fit the tank for a heavy fish

• Cave: one pipe or wood hollow large enough for the adult, plus a spare.
• Rockwork: sitting directly on the tank floor, never on top of the sand where it can be undermined.
• Heaters: fitted with guards or placed in a sump or external unit.
• Plants: robust species tied to wood, or none.
• Cover: tight-fitting and heavy enough to stay in place.

Match the water to a hardy fish

Planet Catfish notes that fish sold today are pond-bred and hardy, and adapt to most water conditions beyond the ranges published for the species. The sources still differ on the ideal values, so aim for the band where they overlap.

Aim for about 25–26°C and pH 7.0–7.5 with medium hardness. UK tap water differs widely between regions, so test your water, or read your water company's report, before deciding whether it needs any adjustment; because this fish is so adaptable, stable conditions matter more than hitting an exact figure. Our water chemistry guide explains the readings.

Separate habitat values from waste readings

The habitat values have some leeway; the waste readings do not. OATA's limits for every fish are zero ammonia, zero nitrite and nitrate no more than 20 mg per litre above your tap water. A fish of this size produces a great deal of waste, so test at least weekly.

Filter heavily for a heavy eater

Practical Fishkeeping calls heavy-duty external power filtration vital, because common plecs are greedy feeders. OATA adds that one or more large aquarium filters, or even a pond filter, may be needed to cope with the solid waste of a very large fish. FishBase lists the species as a facultative air breather, so an occasional trip to the surface for air is normal; leave space under the cover. Our guide to understanding aquarium filtration helps you size the system.

Follow a weekly maintenance sequence

1. Test: ammonia, nitrite, nitrate and pH, at least weekly as OATA advises.
2. Siphon: remove droppings and food from the floor and around the pipes.
3. Change water: at least 25%, treated with conditioner and matched for temperature.
4. Service the filter: rinse mechanical media in removed tank water, never under the tap.
5. Check the fittings: heater guards, rockwork and cover still secure.

Feed vegetables daily with some meaty food

ScotCat describes the species as an omnivore that takes vegetable and meaty foods plus flake, tablet and pellet foods, and notes that it eats algae when young but not so much when older. Practical Fishkeeping recommends commercial staples such as algae wafers alongside vegetables every day, suggesting courgette, cucumber, mange tout, sweet potato and broad beans, which can be blanched and frozen. Good staples include green algae wafers and sinking pleco tablets.

OATA advises feeding once a day and giving only what is eaten within a few minutes, allowing grazing fish up to 30 minutes. Leftover vegetables foul the water quickly, so remove them the next morning.

Build one measured meal

• Staple: algae wafers or pleco tablets, sized to the fish's growth.
• Vegetables: a slice of blanched courgette, cucumber or sweet potato, weighted to the floor.
• Protein: a little meaty sinking food once or twice a week.
• Clear up: remove uneaten vegetables within a day.

Settle a new pleco in gently

OATA recommends double-bagging catfish because their spines can pierce a bag. Switch off the aquarium lights, float the sealed bag for 10 minutes, then add small amounts of tank water over up to 20 minutes before releasing the fish and discarding the bag water. Our guide to acclimatising new fish covers each step. A young pleco usually hides in its first days; place a wafer near its chosen cave at lights-out.

Use a first-week checkpoint plan

Watch growth and behaviour

OATA's signs of good health are clear eyes, intact fins, no ulcers or bumps and steady breathing. With a fast-growing pleco, also measure it every month or two, so you know when it is time to move it to the large aquarium rather than finding out when it is cramped.

Pair each observation with an action

Choose large, robust tank mates

Planet Catfish calls it peaceful as far as large plecos go and suitable with almost any medium-sized community fish, and ScotCat says its robust nature lets it live with most large fish. Practical Fishkeeping warns that it can clash with other large catfish if there are not enough hiding places. As an adult it shares the tank with other big fish rather than a small community.

Screen each tank mate with four questions

1. Will the tank still be large enough when every fish is fully grown?
2. Does its temperature range include 25–26°C?
3. Is there a separate cave for each large bottom dweller?
4. Can the filter cope with the combined waste?

Our tank mates checker and stocking calculator help with both questions, and the common pleco guide and pleco care guide cover large plecos in more depth.

Plan for its whole life, and never release it

OATA reminds keepers that very large fish live longer than small ones and should be looked after for their whole lives, and states that releasing aquarium animals or plants into the wild is illegal, usually causes a lingering death and can harm native wildlife. This is not a theoretical risk: Munson and colleagues published the first UK records of wild sailfin plecos in 2024, a P. pardalis and a P. joselimaianus caught in 2021 in a side channel of the River Kelvin in Glasgow. FishBase notes that the species has been introduced to countries outside its native range, and Practical Fishkeeping describes the damage it does where it becomes established. If you can no longer keep it, contact an aquatic shop or a rehoming group.

Breeding is not realistic at home. Practical Fishkeeping describes spawning in burrows about a metre long, with up to 7,000 eggs per spawn, and Planet Catfish says the fish on sale are bred commercially in outdoor ponds in the United States and the Far East.

Answer Albino Sailfin Pleco buying questions

What is an Albino Sailfin Pleco?

It is the albino form of Pterygoplichthys pardalis, the Amazon sailfin catfish, one of the fish sold as the common pleco. Planet Catfish lists the trade codes L021 and L023 and the names Albino Pleco and Amazon Sailfin Pleco for the species.

How big does an Albino Sailfin Pleco get?

Very big. Planet Catfish gives 423 mm standard length, ScotCat 50 cm, Practical Fishkeeping over 50 cm, and FishBase records 57.8 cm total length. The fish you receive is 5–6 cm, but plan for an adult of 40–50 cm or more.

What size tank does it need?

OATA says very large fish usually need an aquarium in excess of 500 litres as adults, and ScotCat gives a tank of 6 ft (180 cm) or more. A youngster can start smaller, but plan the large tank before you buy.

Will it keep my tank clean of algae?

Not on its own. ScotCat says it eats algae when young but much less as it grows, and Practical Fishkeeping stresses that it is a greedy feeder that needs daily food and heavy filtration. For algae control in an ordinary aquarium, a bristlenose pleco is a better choice.

What water does it need?

It is hardy: Planet Catfish says pond-bred fish adapt to most water conditions. Aim for about 25–26°C and pH 7.0–7.5 with medium hardness, where the published ranges overlap, and keep ammonia and nitrite at zero.

What does it eat?

It is an omnivore. Feed sinking algae wafers and pleco tablets with fresh vegetables such as courgette, cucumber, mange tout, sweet potato and broad beans, as Practical Fishkeeping suggests, plus some meaty food.

Is L021 the same as the Gold Sailfin Pleco?

No. Our Gold Sailfin Pleco is Pterygoplichthys gibbiceps, named for the hump on its head, which P. pardalis lacks. The albino sailfin is a pale, red-eyed form of P. pardalis.

Can I release it or put it in a pond outside?

Never. OATA states that releasing aquarium animals into the wild is illegal and harms native wildlife, and Munson and colleagues recorded the first wild sailfin plecos in the UK, in Glasgow, in 2021. If you can no longer keep it, contact an aquatic shop or rehoming group.

Consult the care references

• Planet Catfish Cat-eLog: Pterygoplichthys pardalis — names including L021, L023, Albino Pleco and Amazon Sailfin Pleco, 423 mm SL, the 10-plus dorsal rays of Pterygoplichthys, the farm-bred amelanistic "chocolate pleco", spotted versus vermiculated belly against P. disjunctivus, sexing, 21–26°C, pH 6.0–7.5, pipes for cover and tank mates.
• ScotCat: Pterygoplichthys pardalis — the two L-numbers L021 and L023, the genus history (Liposarcus), albinos reaching the UK in the early 1990s from Czech breeding and now farmed in the Far East and Florida, a 180 cm tank, omnivore diet, 50 cm, 25–30°C and pH 5.5–7.5.
• FishBase: Pterygoplichthys pardalis, Amazon sailfin catfish — classification, 57.8 cm TL maximum, 23–28°C, pH 7.0–7.5, 10–20 dH, Amazon distribution, introductions outside the range, facultative air breathing and IUCN Least Concern.
• Practical Fishkeeping: The Common plec: A big problem — why common plecs are a big problem: adults over 50 cm, tanks of many hundreds of litres, heavy external filtration, neutral pH and about 26°C, a vegetable-rich diet, simple décor, albino and longfin forms, pond breeding in burrows, and never releasing fish.
• Munson et al. 2024: First records of the introduced sailfin catfish Pterygoplichthys in the United Kingdom — Munson et al. 2024 (BioInvasions Records 13: 241–250): the first UK records of Pterygoplichthys, including P. pardalis, from a side channel of the River Kelvin in Glasgow in 2021.
• Planet Catfish Cat-eLog: Pterygoplichthys gibbiceps — Pterygoplichthys gibbiceps, the hump-headed sailfin sold as the Gold and Leopard Sailfin Pleco, for comparison.
• OATA: How to look after very large fish (tankbusters) — UK guidance on very large aquarium fish: aquariums above 500 litres for adults, heavy filtration, protected heaters, secure décor, a fish-proof cover and never releasing fish.
• OATA: How to look after freshwater catfish — UK guidance for catfish on water quality limits, weekly testing and 25% water changes, double-bagging, the floating-bag method, feeding amounts, sand for the barbels and warning signs.
• Tropical Fish Co delivery policy — current dispatch days and Live Arrival Guarantee terms.