Can Plecos And Discus Fish Live Together? (7 Must-Know Tips)

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Plecos and Discus Fish are both favorites in freshwater tanks. But can they coexist in the same environment?

What do you need to think about if you want them to share a space? How should the tank be arranged, and what are the water and food preferences for each?

Which Pleco varieties work best with this combo, and which ones are a no-go? And what other fish can join the mix?

In this article, I’ll dive into these topics and more, so you leave with all the information you need. Let’s get started.

Can I Keep Plecos and Discus Fish Together in the Same Tank?

Yes, Plecos and Discus can live together in the same tank. They are compatible due to several reasons:

  • Temperature Alignment: Both Plecos and Discus thrive in warm waters, with a range of 82-86°F (28-30°C) being ideal.
  • Peaceful Dispositions: Plecos are typically non-aggressive, which complements the calm nature of Discus fish, reducing stress.
  • Water Parameters: Plecos and Discus both prefer soft, slightly acidic water conditions, ensuring they share similar habitat requirements.
  • Dietary Differences: While Discus primarily consume protein-based foods, Plecos feed on algae and plant matter, minimizing food competition.
  • Size Compatibility: Most Plecos species grow large, but they tend to be bottom-dwellers, while Discus swim in mid-to-upper regions, allowing ample space for both.

Also Read: Pleco Fish Tank Mates

Plecos vs. Discus Fish: Behavior

The first factor worth considering is the Plecos’ and Discus Fish’ natural behavior. Here is what you should know:

Pleco Fish: Natural Behavior

Plecos, primarily nocturnal by nature, use their days to rest and become active feeders at night.

While they’re generally peaceful, they can exhibit territorial behaviors, especially towards other bottom-dwellers.

  • Nocturnal Habits: Plecos are most active at night, rummaging the substrate for food and remaining elusive during the day.
  • Algae-Eating Routine: Their diet mainly consists of algae; Plecos often graze on tank surfaces and various decorations.
  • Territorial Tendencies: As they age, Plecos can become more territorial, fiercely defending their favorite spots in the tank.
  • Bottom-Dwelling Lifestyle: Plecos mostly reside at the tank’s bottom, using their sucker-mouth to latch onto surfaces.

Discus Fish: Natural Behavior

Recognized as the “kings” of the freshwater tank for their stunning looks and elegant mannerisms, Discus are communal and prefer swimming in groups.

They have a unique way of communicating through subtle shifts in their coloration.

  • Schooling Behavior: Discus naturally prefer company, swimming in harmonious groups and displaying their vivid colors.
  • Sensitive Nature: Highly attuned to their surroundings, Discus can experience stress easily, leading to noticeable color changes.
  • Communication Through Color: Discus will adjust their color intensity to communicate, often relating to mood or environmental factors.
  • Mid-to-Upper Swimming: Unlike Plecos, Discus usually swim in the mid-to-upper sections of the tank, making them more visible to onlookers.

Ideal Parameters for Plecos and Discus Fish

For successful aquaculture, it’s crucial to understand and adhere to the ideal parameters for each fish type.

This table simplifies the optimal conditions for Plecos, Discus, and a shared tank environment.

ParameterPleco FishDiscus FishBoth Types
pH Level6.5-7.56.0-7.56.5-7.5
Water Hardness4-15 dGH1-8 dGH3-10 dGH

Pleco Fish: Ideal Parameters

Plecos, being tropical fish, require warm water. The water conditions should also favor a specific pH and hardness to ensure their well-being and longevity.

  • Temperature Needs: Plecos thrive in water temperatures ranging from 74°F to 80°F (23°C to 27°C).
  • pH Level: The ideal pH for Plecos is slightly acidic to neutral, falling between 6.5 and 7.5.
  • Water Hardness: Soft to moderately hard water is best, with a dGH between 4 and 12.

Discus Fish: Ideal Parameters

Discus, originating from the Amazon basin, have distinct requirements when it comes to water conditions.

Warm temperatures, specific pH levels, and soft water are essential for their survival.

  • Temperature Preferences: Discus prefer warmer waters, ideally between 82°F and 86°F (28°C to 30°C).
  • pH Requirements: Acidic conditions are best for Discus, with a pH range of 6.0 to 7.0 being ideal.
  • Water Hardness: Extremely soft water is crucial for Discus, targeting a dGH below 4.

Plecos vs. Discus Fish: Tank Setup

Maintaining a conducive environment in the tank is foundational to the well-being of both Plecos and Discus fish.

Here’s a comparative look at their tank setup needs and what’s ideal when they cohabit.

Setup FactorPleco FishDiscus FishBoth Types
Ammonia0 ppm0 ppm0 ppm
Nitrite0 ppm0 ppm0 ppm
Nitrate<20 ppm<20 ppm<20 ppm
Tank SizeMinimum 55 gallonsMinimum 55 gallonsMinimum 100 gallons
FoliageSome, for hidingSome, with open spacesMixture of both
DecorationsCaves/driftwoodFew, avoid sharp onesCombination of both
FilterStrong, for wasteGentle flowStrong with gentle areas
SubstrateSand/gravel mixFine sandSand with some gravel

Pleco Fish: Tank Setup

Plecos, due to their potential large size and unique behavior, have specific tank requirements. A well-setup tank can ensure a healthier and more active Pleco.

  • Ammonia Nitrite Nitrate: Like all fish, Plecos require low levels. Regular testing should show less than 0.25 mg/L for ammonia and nitrite and under 40 mg/L for nitrate.
  • Tank Size: Given their potential size, Plecos require large tanks. A minimum of 55 gallons is recommended, with larger species needing even more space.
  • Foliage: Plecos love hiding spots. Offering plants and driftwood can provide essential cover and resting places.
  • Decorations: Caves or PVC pipes offer ideal hiding places, making Plecos feel secure in their environment.
  • Filter: A strong filter, like a canister filter, ensures clean water and proper oxygenation for Plecos.
  • Heater: Being tropical fish, Plecos require a heater to maintain a temperature range of 74°F to 80°F.
  • Substrate: A softer substrate, like sand or fine gravel, prevents injury to the Pleco’s sensitive barbels.
  • Pump: A moderate water flow, achieved through an appropriate water pump, simulates their natural habitat.
  • Lighting: Plecos don’t have specific lighting needs, but dimmer lights or periods of darkness can simulate their nocturnal habits.

Discus Fish: Tank Setup

Discus fish, known for their beauty and sensitivity, demand specific tank conditions for their well-being. Proper care in setting up their environment ensures their vivid colors and health.

  • Ammonia Nitrite Nitrate: Discus are sensitive. Ammonia and nitrite should be virtually undetectable, and nitrates should be kept below 20 mg/L.
  • Tank Size: A minimum of 55 gallons is suggested for Discus, with additional space for every added fish.
  • Foliage: Tall plants and floating plants provide shade, comfort, and hiding spots for Discus.
  • Decorations: Smooth stones and driftwood help in replicating the Discus’s natural Amazonian habitat.
  • Filter: A high-quality filter ensures pristine water conditions, crucial for the sensitive Discus.
  • Heater: A consistent temperature between 82°F and 86°F is paramount for Discus, achievable with a reliable heater.
  • Substrate: Fine sand, mimicking their native habitat, is preferable for Discus tanks.
  • Pump: Gentle water flow is ideal for Discus, replicating the calm waters of the Amazon.
  • Lighting: Soft and diffused lighting accentuates the Discus’s colors while ensuring their comfort.

The Dietary Requirements of Plecos and Discus Fish

Just as humans have varied diets, so do Plecos and Discus fish. This table provides a snapshot of their nutritional needs and the common ground when housed together.

Dietary FactorPleco FishDiscus FishBoth Types
Food TypesAlgae, wafers, veggiesHigh-protein pelletsVaried diet
QuantityAs per fish size2-3% of body weightAdjusted for tank size
Feeding ScheduleEvening2-3 times/dayMorning & Evening

Pleco Fish: Ideal Dietary Requirements

Plecos, with their diverse diet, require a mix of algae-based foods and occasional proteins. Proper feeding ensures growth and health.

  • Food Types: Algae wafers, spirulina, blanched vegetables, and occasional meaty foods suit Plecos.
  • Quantity: Plecos eat a lot. Offer food daily, ensuring they can consume it within a few hours to prevent overfeeding.
  • Feeding Schedule: Nighttime feedings, given their nocturnal behavior, ensure active and natural feeding patterns for Plecos.

Discus Fish: Ideal Dietary Requirements

Discus fish, being carnivorous, crave a protein-rich diet. Proper nutrition brings out their best colors and supports growth.

  • Food Types: High-quality pellets, frozen foods like bloodworms, and brine shrimp are ideal for Discus.
  • Quantity: Feed Discus small amounts multiple times a day, adjusting based on fish size and activity.
  • Feeding Schedule: Regular feedings, typically 2-3 times daily, ensure optimal growth and health for Discus.

Pleco Species Most Suitable for a Tank With Discus Fish

Certain Pleco species, due to their size, temperament, and environmental requirements, fit well with Discus fish.

Choosing the right Pleco species can ensure harmony and coexistence within the tank.

  • Bristlenose Plecos (Ancistrus spp.): This smaller Pleco species, growing up to 4-6 inches, is non-aggressive and ideal for a Discus tank.
  • Clown Plecos (Panaqolus maccus): With their maximum size of around 3.5 inches, they’re peaceful and won’t disturb Discus.
  • Rubber Lip Plecos (Chaetostoma spp.): Typically around 4-7 inches, these Plecos are calm and focus on algae consumption.
  • Blue Panaque (Panaque cochliodon): A bit larger at up to 9 inches, they’re still compatible with Discus due to their peaceful nature.
  • King Tiger Pleco (Hypancistrus spp.): At about 5 inches max, they are non-aggressive and appreciate the same water parameters as Discus.

Also Read: Can Plecos And Angelfish Live Together?

King Tiger Pleco

Which Pleco Types Shouldn’t Be Kept with Discus Fish?

While many Pleco species can peacefully coexist with Discus, certain species may not be a good fit due to their size, behavior, or specific needs.

  • Common Pleco (Hypostomus plecostomus): These can grow massive, up to 24 inches, potentially stressing or even preying on smaller Discus.
  • Sailfin Plecos (Pterygoplichthys spp.): Growing up to 20 inches, their size and activity might overwhelm and stress Discus.
  • Royal Plecos (Panaque nigrolineatus): Even though they’re peaceful, their potential size of 17 inches can be too large for a Discus tank.
  • Vampire Plecos (Leporacanthicus spp.): Their aggressive feeding behavior and potential size can make them unsuitable for a Discus environment.
  • Pseudacanthicus spp.: Often reaching 10-12 inches, their territorial behavior might pose challenges in a tank with Discus.

How to Introduce Your Pleco to a Tank with Discus Fish

When introducing a Pleco to a tank with Discus fish, it’s essential to create a seamless transition to prevent stress and territorial disputes.

With careful consideration and planning, your Pleco can integrate smoothly.

  • Quarantine First: Set up a separate tank and keep the Pleco isolated for 2-4 weeks, monitoring for signs of illness or parasites.
  • Match Water Parameters: Over 7 days, adjust the Pleco’s water, matching the Discus tank’s temperature, pH, and hardness levels.
  • Use a Drip Acclimation: Over 1-2 hours, drip Discus tank water into the Pleco’s bag to balance temperature and water chemistry.
  • Introduce During Dusk: Add the Pleco during the evening, utilizing their nocturnal nature to reduce immediate confrontations.
  • Monitor Closely: Observe interactions for a week; look for signs of stress, like rapid breathing or hiding continuously.

Tips for Keeping Plecos with Discus Fish

Maintaining harmony between Plecos and Discus in a shared tank requires regular attention and specific measures to ensure both species thrive.

  • Provide Hiding Spots: Offer multiple caves, PVC pipes, or driftwood pieces; this ensures Plecos have retreat spaces. My recommendation: Dr. Moss Malaysian Driftwood (link to Amazon).
  • Maintain Clean Water: Commit to bi-weekly water changes, removing 20-25% and replacing with dechlorinated water.
  • Feed Separately if Needed: Use sinking pellets for Plecos during the evening and floating foods for Discus in the morning. My recommendation: Hikari Cichlid Excel Pellets (link to Amazon).
  • Check Temperature Regularly: Use a reliable thermometer, maintaining 82°F-86°F for Discus and 74°F-80°F for most Plecos.
  • Ensure Sufficient Space: In a 55-gallon tank, keep a maximum of one Pleco and five Discus to prevent overcrowding.
  • Avoid Overfeeding: Monitor food consumption; uneaten food within 30 minutes indicates overfeeding and potential water quality issues.
  • Observe for Aggression: Weekly observations help. If a Pleco becomes territorial, consider rearranging tank decorations to disrupt established territories.

Best Tank Mates for Plecos and Discus Fish

Plecos and Discus fish, while unique in their needs, share certain compatibilities with a variety of tank mates.

Choosing the right co-inhabitants ensures a balanced and harmonious aquarium environment.

  • Corydoras Catfish: These bottom dwellers, much like Plecos, peacefully sift the substrate for food and coexist well with both species.
  • Cardinal Tetras: Being small and non-aggressive, they swim in the mid-to-upper tank regions, not competing with Plecos or Discus.
  • Rummynose Tetras: Their active swimming patterns provide visual interest, and they don’t bother Plecos or Discus due to their peaceful nature.
  • Hatchet Fish: Preferring the upper tank areas, their unique shape adds diversity and they are peaceful towards Plecos and Discus.
  • German Blue Rams: These dwarf cichlids, colorful and calm, can share the middle regions of the tank without troubling Plecos or Discus.
  • Sterbai Cory: Like other Corydoras, they’re ideal bottom dwellers that harmoniously live alongside Plecos and Discus without causing disruptions.

Also Read: Can Plecos And Flowerhorns Live Together?

Hatchet fish


For those of you who are just skimming through, here’s a short recap:

  • Plecos and Discus can share a tank comfortably due to their similar temperature preferences, calm demeanor, and water requirements, reducing any potential conflicts.
  • Knowing their behavior is key: Plecos are nocturnal and stick to the tank bottom, while Discus are more social and prefer mid-to-upper tank areas.
  • To keep them thriving together, focus on maintaining the right water conditions, tank setup, and feeding habits for both species.
  • Choose the right Pleco species, like Bristlenose and Clown Plecos, to ensure a peaceful coexistence while avoiding larger or aggressive ones.
  • Introducing Plecos with care, providing hiding spots, clean water, and mindful feeding, and selecting compatible tank mates like Corydoras and Tetras will promote a harmonious aquarium environment.