Home

/

Fish species

/

Royal Pleco

Royal Pleco

Breed InfoHabitatNutritionHealth

Origin

South America

Habitat Size

50-150 Liters

Water Type

Fresh Water

Water Temperature

23º-27ºC

Cost in India

₹200 - ₹300

Size

10 - 16 inches (Medium)

Diet

Herbivore

Royal Pleco with black stripes and red eyes resting on sand near green plants
written by image

by Happy Pet TeamUpdated on 2 Dec 2025

The Royal Pleco (Panaque nigrolineatus) is a big, strong-looking catfish with dark stripes that many people love for large aquariums. It’s special because it eats and digests wood — not many fish do that — and it spends a lot of time scraping food off driftwood with its round suckermouth. Young fish hide a lot and become more confident as they grow.

Royal Pleco Origin

  1. Comes from South America — mainly the Orinoco and parts of the Amazon (Colombia, Venezuela, Brazil)
  2. Wild varieties and trade variants (L-numbers like L190 / L191) are common in the aquarium hobby

Temperament

  1. Mostly peaceful and slow-moving
  2. Nocturnal — more active at night and shy in bright light
  3. Can be territorial toward the same species or similar plecos if the space is too small

Royal Pleco Compatibility

Good with calm community fish that are mid-to-top swimmers, such as:

  1. Congo Tetra
  2. Silver Dollar Fish
  3. Black Skirt Tetra
  4. Jaguar Cichlid
  5. Headstanders
  6. Rummy Nose Tetra
  7. Silver Arowana

Avoid:

  1. Very small fish that the pleco could stress, or very aggressive species that bully bottom dwellers
  2. Also, avoid other large wood-eating plecos in cramped tanks

Royal Pleco Price in India

  1. Juveniles and small specimens in India often sell around ₹2,700 – ₹3,100 for common L190 / L191 types (prices vary by size and seller)
  2. Larger or rarer variants can cost more

Characteristics

Temperament

Aggressive

Friendly

Compatibility with other fishes

Not Friendly

Super Friendly

Habitat Size

Small

Large

about image

Royal Pleco Habitat requirements

Initial Setup Cost

₹10,000 - ₹30,000

Water Temperature

23º -27ºC

Water Type

Fresh Water

PH Level

6 - 7.5

Tank type

  1. Freshwater

Royal Pleco Aquarium size

  1. 125 gallons (≈450 L) for an adult L190
  2. Some variants need 180+ gallons as they grow very large (many can reach 35–43 cm / 14–17 in in time)
  3. Give plenty of floor space

Water conditions

  1. Temperature: 22–30°C (76–82°F)
  2. pH: 6.5–7.5 (slightly acidic to neutral)
  3. Water hardness: soft to moderately hard — keep ammonia and nitrite at 0 ppm, nitrate low

Royal Pleco Environment needs

  1. Lots of driftwood — both for hiding and as a food source (they rasp wood and feed on the biofilm)
  2. Strong filtration and good oxygenation — these are large, messy fish that need clean, well-oxygenated water
  3. Provide caves, large roots, and hiding spots so the pleco can rest during the day. Keep the lighting dim or add shady spots

Essential Equipment

Aquarium tank

Water filter

Heater

Light

Substrate

Royal Pleco Nutritional Guide

Avg Monthly Expenses

₹200 - ₹ 300

Royal Pleco Diet type

  1. Primarily herbivore / xylophagous (wood-eating plus plant-based foods)
  2. In aquaria, they are best treated as mainly plant-eaters with a need for wood

Suitable foods

  1. Driftwood (essential) — the fish rasp wood and digest wood-associated microbes
  2. Vegetables:
  3. Blanched zucchini
  4. Cucumber
  5. Sweet potato
  6. Peas
  7. Sinking herbivore wafers, algae wafers, spirulina pellets.
  8. Occasional protein (bloodworm or shrimp) is okay for variety, but should not be the main diet.

Royal Pleco Feeding frequency & tips

  1. Offer small portions daily or every other day
  2. Remove uneaten soft foods after a few hours to keep the water clean
  3. Always keep driftwood in the tank — it’s not just decor, it’s part of their diet and digestion.
about image

Royal Pleco Health & Care

Common Health Issues

Fin rot

Pop eye (swollen eyes)

Color dimming

White spot / ick

Anchor worm

Fungal infections

Signs of good health

Active

Good apetite

Signs of sickness

Loss of appetite

Lethargic behaviour

Frequent hiding

Dull coloring

Swimming abnormally

Like all aquarium fish, the Royal Pleco needs clean water, a proper diet, and enough space to stay healthy. When their surroundings are not right or their food lacks nutrients, they can easily get sick. Below are some common Royal Pleco health problems and how to care for them.

Ich (White Spot Disease)

Ich is caused by a parasite and shows as tiny white dots on the body and fins. In royal plecos, you may first notice rubbing or hiding more than visible spots because plecos can mask signs. Raise the temperature a little and treat with a pleco-safe anti-ich medication, but always check the product is safe for bottom-dwellers and for wood-eaters. Keep water very clean while treating, and do partial water changes to lower stress. (Symptoms: scratching, reduced appetite; Treatment: medicated baths or tank treatment appropriate for catfish, improved water quality.)

Skin or fin infections (bacterial)

Ragged fins, red patches, or cloudy eyes within fish may come from bacterial infections from cuts, poor water quality, or stress. Improved water conditions may resolve these. The removal of the affected fish to a quarantine tank may also resolve these. There are broad-spectrum antibiotics safe enough around catfish. Good hygiene, a healthy, well-run tank, along with the best food possible, can help prevent these infections. Water changes, antibacterial medications, and better food can remedy torn fins and lack of energy.

Malnutrition/undernourishment

Many young royal plecos are imported thin and need special care to recover. Signs include a thin body, low activity, and poor color. Offer high-quality vegetable diets, algae wafers, and constant access to driftwood; monitor weight and feeding closely. Recovery can take weeks, but it is possible with steady, appropriate food and very clean water. (Symptoms: thin body, low growth; Treatment: nutrient-rich plant foods, wood access, patience.)

Royal Pleco General health tips

  1. Keep excellent water quality (0 ammonia/nitrite; low nitrate)
  2. Use strong filtration and perform regular water changes
  3. Provide constant access to driftwood and a varied plant-based diet
  4. Quarantine new fish to avoid introducing diseases

Prerequisites for a Fish

Adequate tank space

Cleanliness

Effort & commitment

Enriching Environment

written by image

Written by

Happy Pet Team

Author

Team Happy Pet is a passionate collective of pet experts, enthusiasts, and advocates dedicated to sharing trusted and insightful content.

Our cont 

Frequently Asked Questions

Are Royal Plecos suitable for beginners?

Royal Plecos are more suitable for aquarists with intermediate experience due to their specific care needs.

What are common health issues for Royal Plecos?

Common issues include fin rot, pop eye (swollen eyes), color dimming, white spot (Ich), anchor worm, and fungal infections.

What should I do if my Royal Pleco shows signs of illness?

Quarantine the fish, test the water parameters, and seek advice from a veterinarian for appropriate treatment.