A Comprehensive Guide to Growing Monte Carlo Aquarium Plants

Monte Carlo (Micranthemum tweedei)

Are you looking to add a touch of vibrant green to your aquarium? Look no further than the Monte Carlo plant. Known for its small-rounded leaves and creeping stems, this aquatic plant is a favorite among hobbyists. In this guide, we will explore the best practices for cultivating and caring for Monte Carlo plants in your aquarium.

Quick Facts about Monte Carlo

  • Common Name: Monte Carlo
  • Other Names: New Large Pearl Grass, Bacopita
  • Scientific Name: Micranthemum Tweediei
  • Difficulty: Easy to medium
  • Lighting: Medium to high
  • Optimal pH: 5.5 – 7.5
  • Optimal GH: 2 – 15
  • Optimal Temperature: 20 – 25°C (68 – 77°F)
  • Substrate: Needed
  • Growth Rate: Moderate
  • Placement in Tank: Mostly foreground / midground
  • Height: 3 – 6 cm (1 to 2.25 inches)
  • CO2: Not needed – Low
  • Propagation: Splitting, cutting off daughter plants

Origin and Habitat of Monte Carlo

Native to the riversides, marshes, and banks of South America, Monte Carlo is a versatile plant that thrives in various tank sizes. Its scientific name, Micranthemum tweedei, pays homage to the city of Monte Carlo in Argentina, where it was first discovered by Japanese collectors. The plant is also known as “Bacopita” in South America, “Monte Carlo,” and “New Large Pearl Grass” among hobbyists.

Description of Monte Carlo

With its vibrant light green color, small structure, round leaves, and long filiform creeping stems, Monte Carlo adds elegance to any aquarium. This plant forms dense mats or carpets, creating a lush and natural aesthetic.

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Water Parameters and Tank Requirements

To ensure optimal growth and development, it is crucial to maintain the right water parameters for Monte Carlo plants. Here are some key considerations:

Tank Size:

While Monte Carlo is suitable for nano tanks, it is recommended to have a minimum tank size of 5 gallons (20 liters). A larger tank, ranging from 10 to 20 gallons (40 – 80 liters), will allow the plant to thrive alongside other inhabitants.

Temperature, pH, and Hardness:

Maintaining a temperature range of 20 – 25°C (68 – 77°F) is ideal for Monte Carlo plants. The plant can tolerate a pH range of 6.0 – 7.5 and a water hardness level of up to 15 GH.


Proper lighting is essential for the growth and survival of Monte Carlo plants. Moderate to high lighting is recommended for optimal results. Consider using the Finnex Ray models for reliable lighting solutions.


Monte Carlo thrives when planted in a fine or small-grained substrate. Opt for nutrient-rich soil substrates like Caribsea Eco-Complete Aquasoil, Seachem Flourite Black Sand, or Fluvial Stratum to promote healthy growth.


While not mandatory, injecting CO2 periodically and using liquid fertilizers like Seachem Flourish can accelerate the growth and density of Monte Carlo plants.

Planting Monte Carlo

Monte Carlo (Micranthemum tweedei)

Planting Monte Carlo is a straightforward process. Here are the steps to follow:

  1. Obtain potted plants from a trusted pet store or online vendor. Tissue culture Monte Carlo is recommended for its cleanliness and absence of pests.
  2. If using tissue culture plants, remove the plant from the plastic container and rinse it in clean water to remove the nutrient gel.
  3. Split the plant into small pieces using tweezers.
  4. Dip each piece into the substrate, ensuring it is inserted deep enough to prevent the plantlets from coming out.
  5. For nursery-grown plants, remove the pot, detach the rock wool from the plant, and rinse thoroughly. Proceed with steps 3-4 as mentioned above.
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Tip: If the plants come loose from the substrate, gently wedge them back in and allow them to form roots for anchorage. Additionally, consider utilizing the Dry Start Method for planting and growing Monte Carlo.

Tips for Growing a Perfect Carpet

To achieve a lush and healthy Monte Carlo carpet, consider the following tips:

  • Lighting: Ensure adequate lighting to avoid elongated growth. Increasing light intensity promotes greener and denser foliage.
  • Substrate: Use nutrient-rich soil substrates like ADA Amazonia Aqua Soil, Carib Sea Eco-Complete, or Seachem Flourite to enhance carpet structure.
  • Trimming: Regularly trim the plants to maintain optimal carpet thickness. This encourages new side shoots and runners, resulting in a more compact carpet.
  • Patience: Allow the plants time to grow and form a dense carpet. Be patient and avoid rushing the process.

Maintenance of Monte Carlo

Monte Carlo (Micranthemum tweedei)

Monte Carlo plants typically take 4-8 weeks to form compact mats or carpets. With proper care, the plant will grow rapidly, requiring regular trimming every 2 weeks or as needed. When trimming, use specialized pruning scissors to avoid damaging the plant.

After trimming, remove detached parts from the tank to prevent the accumulation of debris and excess ammonia. If you notice any dead or unhealthy plants, remove them promptly to maintain a healthy carpet.

Difficulties and Problems Associated with Monte Carlo

Understanding and addressing potential issues can help ensure the success of your Monte Carlo carpet. Here are some common difficulties and solutions:

  • Melting: High nitrite levels can cause the Monte Carlo to melt. Regular water changes will help address this issue.
  • Brown Coloration: Insufficient light reaching the base of the plant can lead to brown coloration and stunted growth. Regular trimming allows light to penetrate uniformly.
  • Yellow Coloration and Slow Growth: Maintaining a carpet height of 3-4 cm (1 – 1.5 inches) prevents yellowing of stems and promotes healthy growth.
  • Attachment: Monte Carlo plants may occasionally detach from the substrate. Wedge them back in deep enough to allow for root formation.
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Monte Carlo and Tankmates

Monte Carlo is compatible with various tankmates. Pair it with stem plants like Rotala Indica, Water Wisteria, Italian Val, or AR Mini for a striking underwater landscape. Additionally, consider keeping non-aggressive fish and shrimp, such as Clown loaches, Mollies, Neon tetras, and Cardinal tetras, alongside Monte Carlo.

Buying Monte Carlo

Monte Carlo (Micranthemum tweedei)

Monte Carlo plants are readily available in aquarium stores and online vendors. Prices typically range from $10 – $15 per pot. When purchasing, select healthy plants with no spots or tears for optimal growth and longevity.

Quarantine Monte Carlo

Before introducing any new plants to your tank, it is essential to quarantine them. This precaution helps prevent the introduction of parasites, pests, or other unwanted organisms. Quarantining also allows you to treat the plants without harming fish, shrimp, or other tank inhabitants.

In Conclusion

Don’t be intimidated by the idea of cultivating carpeting plants in your aquarium. Monte Carlo offers a delightful option that is easy to care for and visually appealing. With its delicate appearance, adaptability, and ability to provide cover for fry and shrimp, Monte Carlo is a favorite among hobbyists. Follow the guidelines in this comprehensive guide to successfully grow a lush Monte Carlo carpet in your aquarium.

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  • Top 8 Carpeting Plants for Planted Tanks
  • Top 7 Floating Plants for Beginners
  • 10 Tips For Rooted Aquarium Plants

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