Tiger Pleco (L397) Care Guide: The Ultimate Wood-Eating Catfish

Species Overview#

An L397 pleco is Panaqolus sp. L397, a small wood-eating catfish sold as the Alenquer tiger pleco or Tangerine tiger pleco. It wears black and burnt-orange bands that look painted on. Most references put adults at about 5 inches, so unlike the Common Pleco, L397 stays manageable and gets along with community fish. The catch is that it does not eat algae the way the pet-store label suggests. It eats wood, and if you don't give it enough, it slowly starves in a tank that looks "clean."

"L397" is not a species name. It is a code from the L-number system, an informal catalog that the German aquarium magazine DATZ started in 1988 to label the many new plecos coming out of South America faster than scientists could formally describe them. L397 has never been formally described, so it has no Latin species name, and the IUCN has not assessed it. Many Panaqolus forms are in the same position, but not all of them: the clown pleco (Panaqolus maccus) and P. tankei (L398) both have formal names.

Adult size

4.5-5 in (11-13 cm); up to 6 in reported

Origin

Rio Curuá-Una, Pará, Brazil

Min tank

30 gallons (114 L), long footprint

Temperature

75-86°F (24-30°C)

Temperament

Peaceful, territorial with own kind

Diet

Wood-eater; plant-based foods

Identifying the L397 vs. L002, L015 and L398#

"Tiger pleco" is a loose trade name, and several different fish are sold under it. This page covers L397, which has bold, high-contrast black and orange bands. Catfish Codex notes the very striking color of juveniles. Sellers also use names such as Alenquer tiger, Tangerine tiger, orange tiger, and "Red Alenquer tiger" for L397. These are trade names, not species names, so check the L-number rather than the label. These are the look-alikes a buyer is most likely to run into:

• L002 (Panaqolus sp.): often called the original tiger pleco. PlanetCatfish gives its type locality as the Rio Tocantins at Cametá, not the Xingu, and lists it at about 100 mm (3.9 in) standard length. That makes it no bigger than L397. Aquarist Atlas records L002 as a known hybrid partner of L397, so fish of mixed parentage do exist.
• L015 (Peckoltia vittata): the "candy stripe" or tiger pleco, widely distributed in the Amazon basin, including the Xingu. It belongs to a different genus and reaches about 15 cm (6 in) total length.
• L398 (Panaqolus tankei): a tiger pleco from the Xingu basin that was formally described in 2016.
• L403 and L374: other tiger-patterned Panaqolus from Pará. SeriouslyFish gives L403's origin as the Rio Anapu and notes that its export is banned. Aquarium Glaser places L374 in the Rio Nhamundá.

The king tiger pleco (L066) is a Hypancistrus, a different genus. If you searched for "L379," check the digits on the tag: this page covers L397, and every L-number is a different fish.

Natural Habitat: Rio Curuá-Una near Alenquer#

Aquarist Atlas, AquaInfo and Catfish Codex all give L397's locality as the Rio Curuá-Una in Pará, Brazil. The fish was exported through the town of Alenquer, which is where the trade name comes from. Some retailers describe it as coming from "the mouth of the Tapajós" near Alenquer, but the Curuá-Una is a separate river.

We could not find published water chemistry for the collection site, so the parameters below come from the keeping ranges in specialist references, not from field measurements. Like other Panaqolus, L397 spends the day wedged into crevices and under wood and comes out in low light to graze on wood surfaces and the biofilm that grows on them. Give it warm water, good oxygen, and enough wood that it always has something to chew.

How Big Does an L397 Pleco Get? (Max Size and Lifespan)#

The answer depends on how the fish is measured. Standard length (SL) runs from the snout to the base of the tail. Total length (TL) includes the tail.

• PlanetCatfish: 110 mm (4.3 in) SL
• Catfish Codex: 13 cm (5 in)
• AquaInfo: 11-15 cm (4.3-5.9 in)
• Aquarist Atlas: about 6 in (15 cm) TL

Part of the gap comes from SL versus TL. A full-grown L397 is about 4.5-5 inches long for most keepers, and some reach 6 inches including the tail. Size the tank for 6 inches. You may read that a 6-inch fish must be a mislabeled L002, but that does not hold up: PlanetCatfish lists L002 as the smaller of the two.

Growth rate and age at maturity are unresolved. Sources disagree: some describe L397 as quick to mature and others as fairly slow, and we found no measured growth data. Expect a juvenile to take at least a year to reach breeding size.

Lifespan has no verified figure. Retail care sheets claim up to 15 years, but we found no scientific or registry source for L397, so treat it as a fish you will keep for many years.

Water Parameters & Tank Requirements#

Captive-bred L397 handle a fairly wide range of water. What they need is warm, well-oxygenated, stable water.

Temperature and Flow (75-86°F range, 78-82°F target)#

PlanetCatfish lists 24-30°C (75-86°F) for L397, and AquaInfo gives 23-30°C. SeriouslyFish uses the same 24-30°C for its congener L403. Most keepers run 78-82°F (26-28°C), which sits comfortably inside every published range and leaves room on hot summer days.

Keepers give Panaqolus surface agitation, steady water movement, and at least one sheltered spot out of the current. A canister filter return alone often does not move enough surface water, so many keepers add a small powerhead or an air stone. If your pleco pumps its gills rapidly at rest or hangs near the surface, check oxygen first.

pH and Hardness (pH 6.4-7.5 target)#

Published pH ranges vary: PlanetCatfish lists 6.4-7.7, Aquarist Atlas gives a keeping range of 6.0-7.0, and AquaInfo gives 5.5-7.5. A target of 6.4-7.5 fits all of them except the very top of PlanetCatfish's range. For hardness, AquaInfo and SeriouslyFish (for L403) both give roughly 2-10 dGH. PlanetCatfish describes L397 as relatively tolerant of water hardness, and AquaInfo says hardness is not an issue even for breeding.

Since nearly every L397 sold today is captive-bred, most keepers can use dechlorinated tap water in that general range without RO. Stability matters more than any exact number. Avoid pH-down chemicals, because they cause the swings that stress plecos more than slightly-off but stable water. For the cycling basics that have to be in place before any pleco goes in, see our freshwater fish guide.

Minimum Tank Size (30 gallons, long footprint)#

A 30-gallon (114 L) tank is the practical floor for one L397 or a pair, and floor space matters more than volume. SeriouslyFish recommends a base of 120 x 30 cm (about 47 x 12 in) for the closely related L403, and AquaInfo and Aquarist Atlas give a length of about 100 cm (39 in). A standard 30-gallon long is 36 inches, so a 4-foot tank is the better choice if you have the space. Run your measurements through our tank volume calculator to compare tanks.

Aquarist Atlas notes that L397 can be kept singly or in small groups. Adding more males means adding more floor space and more caves.

The Necessity of Driftwood (Essential for digestion)#

This is the single most important point in this guide: a Tiger Pleco needs driftwood at all times. Aquarist Atlas classes L397 as a wood-eater, and SeriouslyFish states that wood must be provided for tiger Panaqolus. Treat wood as a required part of the diet, not decoration.

The reason is less tidy than older care sheets claim. Research on wood-eating catfishes (German, 2009; German and Bittong, 2009) found that they do not rely on cellulose-digesting gut microbes. Food moves through their guts quickly, and they seem to get their nutrition from the soft, biofilm-coated wood surface and the material that comes with it, not from the wood fiber itself. Those studies looked at the larger genus Panaque, not L397 itself, and Dr. Jonathan Armbruster told Practical Fishkeeping that the jury is still out. The practical takeaway is the same: no wood means no grazing surface and no steady food source.

Keep several pieces of soft, edible driftwood in the tank and look for fresh rasp marks. If the wood looks untouched after a few weeks, check that the fish is eating. Our aquarium dimensions guide covers footprint planning.

A Wood Selection Guide for L397#

There is no published standard for which wood is best. These notes come from common keeper practice:

• Malaysian driftwood: Dense, sinks immediately, and breaks down slowly. Good long-term grazing and hiding wood. Moderate tannins.
• Mopani: Two-tone and dense. Releases heavy tannins that can stain water amber, and wears down slowly.
• Cholla wood: Hollow, soft, and quick to break down. A favorite "snack" wood, and its porous structure holds biofilm. Expect to replace it.
• Manzanita: Branching shape, low tannins. Pleco-friendly once fully waterlogged.
• Spider wood / Azalea root: Decorative but dense. Use it for structure, not as the main food wood.
• Oak, pine, cedar, redwood: Avoid. Resins and treatments can foul the tank.

Pair one large structural piece (Malaysian or manzanita) with smaller, softer pieces the fish chews down, and replace those as they wear away.

Diet & Feeding#

What Does an L397 Pleco Eat?#

An L397 pleco eats wood first, then plant matter. Aquarist Atlas classes it as a wood-eater. AquaInfo calls it an omnivore that eats plant matter and wood and takes some mosquito larvae. SeriouslyFish advises against meaty foods for tiger Panaqolus. In the tank, that means driftwood around the clock, a plant-based staple, and only small amounts of protein.

Algae wafers alone are not a complete diet, and algae was never this fish's main food. Without wood, the fish loses its main grazing surface.

Supplementing with High-Fiber Wafers and Repashy#

Keepers build the rest of the diet around high-fiber, plant-based foods. Repashy Morning Wood and Soilent Green are both marketed for wood-eating plecos, and sinking wafers from Hikari, Omega One, or Xtreme work as everyday foods.

Plecos are most active after dark, so feed around lights-out. Give an amount the fish finishes overnight, and remove leftovers in the morning to protect water quality.

Fresh Veggies: Zucchini, Cucumber, and Sweet Potato#

A few times a week, blanch a slice of zucchini, cucumber, or sweet potato and weight it to the bottom with a veggie clip. Squash, broccoli stems, and shelled peas also work. Take out anything uneaten the next morning.

Tank Mates & Compatibility#

Best Community Partners (Tetras, Corydoras, Peaceful Cichlids)#

AquaInfo recommends peaceful catfish, tetras, and cichlids that are not too aggressive as tank mates, and L397 does best with fish that live in a different part of the tank. Mid- and upper-water schooling fish like neon tetras, cardinal tetras, rummy nose tetras, and ember tetras never compete with it for space. Sterbai corydoras and panda corydoras make good bottom companions because they graze open substrate while the pleco stays under wood. Gentle cichlids such as the German blue ram also suit warm L397 tanks.

On plants, AquaInfo notes that plants can be eaten. Hardy plants on wood or rock usually do fine, but soft-leaved plants may get nibbled, especially if the fish is underfed.

Territorial Behavior: Managing Male-on-Male Aggression#

L397 is peaceful toward other kinds of fish. With other plecos it can be pushy. Adult males defend caves and will spar with other male Panaqolus, including their own siblings, by flaring their odontodes and shoving each other out of favorite hiding spots. Most squabbles cause no injury, but a dominant male can stress a weaker one enough that it stops eating.

The fix is space and spare hiding spots. Give the tank more caves than plecos, spread them along its length, and break up sight lines with driftwood and rockwork.

Invertebrate Safety: Shrimp and Snails#

Keepers widely report L397 as shrimp-safe, although no specialist source confirms it. Adult amano shrimp, red cherry shrimp, and ghost shrimp usually live alongside it without trouble. Shrimp fry may get picked off by any small fish, but the pleco is rarely the culprit.

Snails like nerites, mystery snails, and Malaysian trumpet snails are generally left alone.

Breeding the L397 Tiger Pleco#

L397 pleco breeding is well established in the hobby. Aquarist Atlas notes the species has been bred repeatedly, and Catfish Codex reports that wild fish are very rarely offered, which means the trade runs on captive-bred stock.

L397 Male vs Female: Odontodes and Body Shape#

Adult males develop bristly odontodes, tiny tooth-like spines on the skin, and have a slimmer waist than females when seen from above. Females look shorter and broader across the belly, especially when full of eggs. Sources disagree on where the male's odontodes appear. PlanetCatfish places them along the back and notes that males have a small, pointed genital papilla. SeriouslyFish describes them on the rear of the body in the related L403, and other accounts mention the pelvic fins. Some care sheets say they grow on the pectoral fins and cheeks, but no source we found supports that. Sexing is easiest when you can compare several adults side by side.

Triggering Spawns: Water Changes and Cave Selection#

L397 spawns in caves. Give each male a clay, slate, or PVC cave just wide enough for his body, with one opening. The male claims a cave and waits for a female.

No published spawning protocol exists for L397. Breeders commonly use a large, slightly cooler water change and point extra flow across the cave entrances, and AquaInfo notes that hardness does not matter much even for breeding. When a female is ready, she enters the cave and lays eggs there. AquaInfo reports clutches of 25-40 eggs about 6 mm (0.25 in) across, and some keepers report slightly larger clutches.

The male alone guards and fans the eggs (AquaInfo). Exact hatch timing is unresolved. A PlanetCatfish excerpt puts yolk-sac absorption at about 7 days, and a retail blog claims the eggs hatch after about a week, but we found no specialist source that states the hatch time directly.

Raising Fry: High-Protein vs. High-Fiber Transitions#

The fry stay in the cave until they have absorbed their yolk sacs, then come out to graze. Give them soft cholla wood, leaf litter, and small pieces of blanched zucchini, plus a fine plant-based food such as Repashy Soilent Green or a powdered fry food in small amounts.

Keep the fry diet plant-heavy from the start, following the same advice against meaty foods that applies to adults. As they grow, move them onto the adult menu of wood, sinking plant-based foods, and vegetables.

Common Health Issues#

Starvation Risks in "Clean" Tanks#

A common way to lose a Tiger Pleco is slow starvation in a tank that looks spotless. The fish hides by day, so the keeper rarely sees it eat. The algae is gone, but it was never the food source, and over months the fish wastes away while everyone assumes it is fine because it is still alive.

The best check is the belly view: look from below when the pleco climbs the glass, or lift it gently in a soft net. A healthy adult has a rounded, full belly with no hollow behind the gills. A starving pleco has a sharply caved-in, pinched belly, which is unmistakable once you have seen it.

Bacterial Infections and Bloat#

Two problems show up regularly. The first is bloat, a swollen belly that keepers usually link to too much protein, poor water quality, or a diet without enough wood and plant matter. If you catch it early, keepers report that a short fast plus clean water often resolves it. If you catch it late, it is often fatal.

The second is bacterial or fungal infection at wounds, usually after territorial fights. Move the fish to quarantine and treat it with a broad-spectrum antibacterial such as Furan-2 or Kanaplex, following the package directions. Keep water quality excellent during treatment. Most "medication failures" are really water-quality failures.

Where to Buy & What to Look For#

Identifying Healthy Specimens (Sunken Bellies vs. Full Bellies)#

The belly check above is the most important test before you buy. Ask the store to net the fish and show you its underside, or photograph it through the glass. Pass on any fish with a hollow belly, sunken eyes, clamped fins, or fast gill movement at rest.

Healthy fish move with purpose, hold the dorsal fin up when undisturbed, and respond quickly when food goes in. Before buying a Tiger Pleco that has been in the store for a while, ask whether staff have seen it eat.

Wild-Caught vs. Tank-Bred Availability#

Almost every L397 for sale is captive-bred. Catfish Codex reports that wild L397 is very rarely offered and that Brazil does not allow its export. Aquarist Atlas notes that L397 appears on neither Brazil's 2012 list of permitted species nor its 2020 list of banned ones, so its legal status is unclear. If someone advertises wild-caught L397, ask for import paperwork.

Prices vary by size, color, and region, and we found no reliable published price data, so compare a few local stores and breeders. If you are weighing L397 against other small plecos, our clown pleco care guide covers the closest alternative from the same genus.

Quick-Reference Cheat Sheet#