L020 Polkadot Pleco (Spectracanthicus zuanoni)

Choose an L020 Polkadot Pleco for a warm, flowing aquarium

The L020 Polkadot Pleco is a white-spotted Spectracanthicus from the Rio Xingu at Altamira, in the Brazilian state of Pará. Planet Catfish and Scotcat both list L020 as Spectracanthicus zuanoni, a species described in 2014 by Carine Chamon and Lúcia Rapp Py-Daniel and named after the ichthyologist Jansen Zuanon, who first collected it and recognised it as new. Scotcat also gives the names L354 and grey-spotted sail-fin pleco, and Planet Catfish records the Brazilian name acari bola branca, the "white-ball pleco".

The L-number has a tangled history. Planet Catfish explains that the original magazine photograph of L020 showed only a colour pattern shared by two different plecos living in the same place in the Xingu: a Baryancistrus and a Spectracanthicus. To settle it, L019 now refers to the Baryancistrus and L020 to the Spectracanthicus. You will still see L020 sold under the name Spectracanthicus punctatissimus, which belongs to its close relative, our L030 Peppermint Pleco.

Tell L020 from the L030 Peppermint Pleco

Care for the two is almost identical, and young L020 share shelters with S. punctatissimus in the wild, so they can be kept together in a large, rocky aquarium. If you already keep our L030 Peppermint Pleco, L020 is a different fish, not a colour form of the same one. The gallery images are representative, prepared from a reference photograph, and do not show the exact fish supplied.

Check the genus features

Planet Catfish separates Spectracanthicus from almost all other plecos by a dorsal-fin membrane that reaches back to the spine of the adipose fin, which gives the fish its "sail-fin" look. It differs from the similar Baryancistrus by having fewer than 25 teeth, and from Parancistrus by its small gill openings.

Select one fish and plan its cave

One purchase quantity supplies one live L020 Polkadot Pleco in the standard size offered. Sex is not specified. Scotcat notes that males develop a longer, broader head and more odontodes, tooth-like skin spines, behind the gill covers and on the pectoral-fin spines; young fish show little difference.

In the wild, Planet Catfish and FishBase record the L020 pleco living alone or in groups of three under boulders, with juveniles in the spaces beneath rocks. A single fish, or a small group with a cave each, suits it well.

Confirm three things before you order

1. Warmth: a heater that holds 26–28°C all year.
2. Flow and oxygen: a filter or flow pump that keeps water moving across the rocks.
3. Caves: a rock cave or crevice for each pleco, plus one spare.

Dispatch days and packing are explained in our delivery information.

Plan the aquarium around the adult size

Planet Catfish gives a maximum of 129 mm standard length and Scotcat 12 cm, both without the tail. FishBase records a much larger maximum of 24 cm total length and 220 g, which includes the tail. Plan for a fish of 13 cm body length or more.

No source gives a tank size for this species. OATA suggests at least 80 litres for the smaller pleco species and points out that a larger aquarium keeps temperature and water quality more stable. For L020, floor space matters more than height: a long base lets you build a line of rock caves, run a current along the tank and keep each pleco's territory apart. Our tank volume calculator converts your measurements into litres.

Use a three-step space check

1. Measure the floor: room for one cave per pleco, spread along the length of the tank.
2. Count adult bodies: each L020 at 13 cm or more, plus every other fish at its adult size.
3. Check the flow: enough pump capacity to keep the whole floor oxygenated.

Build a rocky river bed with current

Planet Catfish describes L020 as a moderately current-loving fish of rock-bottom areas subject to backwaters and strong currents, found down to 2 m deep. Recreate that with smooth, rounded boulders and flat rocks stacked into crevices, over sand or fine gravel. Place rocks on the glass before adding sand, so that nothing can shift. A little wood adds cover, but rock should dominate.

Point the filter outlet or a flow pump along the length of the tank so that water moves over the rocks without blasting the fish off them. Bright light is unnecessary for a night-grazer, but some light on the rocks encourages the natural film of algae it likes to graze.

Divide the footprint by function

Our L-number plecos include several other Xingu species that suit the same layout.

Keep water warm, soft-to-neutral and oxygen-rich

Scotcat advises a strong current and oxygen-rich water for this genus because of the high temperatures it enjoys. The target column keeps inside the ranges for both L020 and its relative L030, and in the lower part of the temperature range, where warm water holds a little more oxygen.

UK tap water varies widely, and your water company publishes the hardness and pH for your postcode. In a hard-water area, blending tap water with reverse-osmosis water is the usual way to bring pH and hardness down; change it slowly and keep each water change consistent. Our water matcher compares your supply with this fish, and our water chemistry guide explains every reading.

Separate habitat values from waste readings

OATA sets these waste limits for aquarium catfish. A river pleco from fast, clean water is quick to suffer when ammonia or nitrite appear, so test every week and act on any reading above zero.

Filter for flow as well as cleanliness

For this pleco the filter has two jobs: keeping the water clean and keeping it moving. Choose filtration rated well above the tank volume, add a flow pump if the filter alone cannot move water across the whole floor, and make sure the surface ripples for gas exchange. Our guide to aquarium filtration explains how to combine the two.

Follow a weekly maintenance sequence

1. Test ammonia, nitrite, nitrate and pH.
2. Siphon the sand around the feeding station and between the boulders.
3. Change at least 25% of the water, the weekly minimum OATA recommends.
4. Condition the new water against chlorine and chloramine, and match the temperature closely.
5. Rinse filter sponges and clean the flow pump in removed tank water, never under the tap.

Feed after dark, with variety

Planet Catfish and FishBase describe L020 grazing algae and other organisms from the film on rocks, feeding mainly at night. Scotcat calls the genus omnivorous and recommends a varied diet of vegetable foods, tablets and frozen foods.

Build one measured meal

• Staple: a few sinking tablets or granules for plecos, dropped near the caves after the lights go out.
• Frozen food: a small portion of bloodworm, mysis or Artemia two or three times a week.
• Vegetable food: an algae wafer or a slice of courgette now and then.
• Clean-up: remove leftovers the next morning.
• Check: look for a gently rounded belly; a hollow belly means it is being outcompeted.

Introduce it to a mature aquarium

Add an L020 only to a mature aquarium with zero ammonia and nitrite, the temperature steady at 26–28°C and the caves already built. OATA recommends double bagging catfish so that their fin spines cannot pierce the bag, and its floating bag method suits this fish: lights off, float the bag for about 10 minutes, then add small amounts of tank water over up to 20 minutes, and release the fish with as little bag water as possible. Our guide to acclimatising new fish covers each step. Move the pleco in a container rather than a net, where its spines can catch.

Use a first-week checkpoint plan

Watch for warning signs and act early

A pleco from warm, oxygen-rich water shows stress quickly when flow or water quality slips. OATA's warning signs for catfish include hanging at the surface, sitting abnormally or swimming erratically, colour change, more hiding or aggression, faster or slower breathing, white spots or fluffy growths, damaged fins, weight change and reduced appetite.

Pair each observation with an action

Choose tank mates from the same river

Planet Catfish lists the plecos found sharing shelters with young L020 in the Xingu: Ancistrus species including A. ranunculus, Baryancistrus xanthellus, S. punctatissimus, Hopliancistrus tricornis, Parancistrus nudiventris, Peckoltia vittata and Pseudancistrus aff. barbatus. That makes a Xingu pleco aquarium a natural choice, as long as every fish has a cave of its own.

Decide from the suits and avoid list

From our range, Xingu companions include the Candy Striped Pleco L015 (Peckoltia vittata), the L034 Medusa Pleco (Ancistrus ranunculus), the L018 Golden Nugget Pleco (Baryancistrus) and the L046 Zebra Pleco. For the midwater, a school of Cardinal Tetra is often kept in warm pleco aquariums. Check every mix with our tank mates tool before you buy, and browse all our catfish and plecos, South American catfish and rare and collector fish. Our pleco care guide covers the basics.

Know what is known about breeding

Planet Catfish records that S. zuanoni has been bred in the aquarium and lists four breeding reports, and its relative S. punctatissimus has been bred too. If you hope to breed L020, keep a small group with several caves and the warm, flowing water described above. The species has not been evaluated on the IUCN Red List; its relative S. punctatissimus is listed as Least Concern.

Answer L020 Polkadot Pleco buying questions

What is the L020 Polkadot Pleco?

L020 is a Spectracanthicus pleco from the Rio Xingu at Altamira, Brazil. Planet Catfish and Scotcat both place L020 in Spectracanthicus zuanoni, a species described in 2014, which Scotcat also lists as L354 and the grey-spotted sail-fin pleco.

Is L020 the same as the L030 Peppermint Pleco?

No. L030 is Spectracanthicus punctatissimus, which has small yellowish to white dots and yellowish tips to the dorsal and tail fins. L020 is S. zuanoni, with large white spots and noticeably bigger eyes. Both live in the Xingu, and young L020 share shelters with S. punctatissimus in the wild.

Why is L020 sometimes sold as Spectracanthicus punctatissimus?

The two fish are close relatives from the same river, and for many years shops and suppliers grouped them together. Current references (Planet Catfish and Scotcat, following the 2014 revision of the genus) list L020 under S. zuanoni and L016, L030 and L315 under S. punctatissimus.

How big does an L020 get?

Planet Catfish gives 129 mm standard length and Scotcat 12 cm, while FishBase records a maximum of 24 cm total length and 220 g. Plan for a fish of 13 cm body length or more.

What water does it need?

Warm, flowing, oxygen-rich water. Planet Catfish gives 25–30°C and Scotcat 26–30°C with pH 5.5–7.0. We suggest 26–28°C and pH 6.0–7.0, with zero ammonia and nitrite and nitrate no more than 20 mg/l above your tap water.

What does it eat?

In the wild it grazes algae and other organisms from rocks, mostly at night. Scotcat describes it as an omnivore, so feed sinking tablets, frozen foods and vegetable foods after the lights go out.

Can it live with other plecos?

Yes, if each pleco has its own cave. In the Xingu young L020 share shelters with plecos such as Ancistrus ranunculus, Baryancistrus xanthellus, Peckoltia vittata and S. punctatissimus, but adults still need separate hiding places.

Can L020 be bred in an aquarium?

Yes. Planet Catfish records that S. zuanoni has been bred in the aquarium and lists four breeding reports.

Consult the care references

• Planet Catfish: Spectracanthicus zuanoni (L020): names, type locality, size, the L019 and L020 history, temperature, habitat, wild companions and breeding.
• Planet Catfish: Spectracanthicus punctatissimus: the L016, L030 and L315 names, size and range.
• Scotcat: Spectracanthicus zuanoni: identification, sexing, diet, aquarium care and water values.
• Scotcat: Spectracanthicus punctatissimus: how L030 differs, water values and conservation status.
• FishBase: Spectracanthicus zuanoni: recorded size and weight, habitat and feeding.
• FishBase: Spectracanthicus punctatissimus: recorded size and identification.
• OATA: How to look after freshwater catfish: UK guidance on tank size, water quality, bagging, acclimatisation, maintenance and health signs.