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Micranthemum tweediei

Micranthemum tweediei

Micranthemum tweediei, widely known as 'Monte Carlo', is a highly sought-after foreground plant that forms a lush, dense carpet in aquariums. Its medium growth rate makes it manageable for aquascapers aiming for a pristine, manicured look.

Taxonomy
Class:Liliopsida
Order:Lamiales
Family:Linderniaceae
Genus:Micranthemum
Species:Micranthemum tweediei

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Water Temperature

20 - 28 °C

pH Value

5 - 7

Water type

Freshwater

Light

Medium to High

CO2

High

Expected height

3 cm

Expected width

15 cm

KH

2 - 12 dKH

Species description

Micranthemum tweediei originates from South America, specifically found in the riverine regions of Brazil and Argentina. In its natural habitat, it typically thrives submerged or semi-submerged along the banks of clear, slow-moving rivers and streams. This adaptability to both emersed and submersed conditions highlights its resilience and versatility in an aquarium environment. A member of the Linderniaceae family, Micranthemum tweediei shares kinship with several other popular aquatic plants. This botanical classification distinguishes it from the often-compared Hemianthus callitrichoides 'Cuba', despite both being commonly used for carpeting purposes.

Care, breeding and tankmates

Micranthemum tweediei thrives in water temperatures ranging from 20 to 28 °C, a slightly acidic to neutral pH (5.0-7.0), and carbonate hardness (KH) between 2.0 and 12.0. Maintaining stable parameters is vital, as significant fluctuations can cause stress to the plant. Clean, well-oxygenated water is preferred to support its healthy growth. While generally robust, Micranthemum tweediei can be susceptible to algal outbreaks, especially under conditions of nutrient imbalance or excessive lighting without adequate CO2. Nutrient deficiencies can manifest as yellowing or shrinking leaves, while poor water circulation can lead to debris accumulation and localized issues within the carpet.

Geographic Origin and Distribution

This species originates from: South America (Brazil, Argentina).

Origin

Amazon, Orinoco, and GuianasExtra-Amazon South America

Plant profile

Placement
Foreground

It is classically used as a foreground carpeting plant in modern aquascapes. Planting it in small, dispersed portions encourages quick lateral spread. It is also effective when allowed to drape over rocks or driftwood.

Botanical form
runner

It features creeping stems adorned with small, rounded, light-green leaves. It creates a dense and cohesive mat over the aquarium floor. The root structure is shallow, making it ideal for soft, fine substrates.

Growth
Medium

The plant exhibits a moderate to fast growth rate under optimal conditions. High lighting and CO2 injection are necessary to achieve rapid carpeting. In lower light, its growth slows significantly and tends to become leggy.

Substrate
High
Column fertilization
Recommended

Liquid fertilization provides the necessary nutrients for its rapid development. Regular dosing of macro and micro elements prevents the leaves from turning pale. It is highly efficient at absorbing nutrients directly from the water.

Root fertilization
Recommended

While it feeds heavily from the water column, planting in nutrient-rich aquasoil yields the best results. Root tabs can be added periodically to replenish depleted substrates. A fine-grained soil helps its delicate roots take hold securely.

Trimming
Occasional

Trimming should be done regularly to keep the carpet thin and firmly rooted. If the mat grows too thick, the lower portions may die from lack of light, leading to detachment. Use curved scissors for an even, horizontal cut.

Propagation
Cuttings

Propagation is easily achieved by taking stem cuttings or dividing the carpet. Replanting small clumps will quickly result in new runners. It naturally propagates by spreading laterally across the substrate.

Sensitivity
Moderate

It can be prone to algae growth on its small leaves if the aquarium is unbalanced. It requires stable water parameters and may melt if subjected to sudden changes. Good water circulation is essential to keep the carpet free of detritus.

Layout role
Foreground

Its primary function is to form a beautiful, vibrant green carpet in the foreground. It softens the hardscape edges and creates a cohesive look. It is often used in Iwagumi layouts to simulate a grassy meadow.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

Recommendations grouped by close relatives, companion choices, and similar care.

Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

Monte Carlo

Monte Carlo

Micranthemum tweediei 'Monte Carlo'

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Micranthemum micranthemoides

Micranthemum micranthemoides

Micranthemum micranthemoides

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Micranthemum sp. "Montecarlo-3"

Micranthemum sp. "Montecarlo-3"

Micranthemum sp. "Montecarlo-3"

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Micranthemum umbrosum

Micranthemum umbrosum

Micranthemum umbrosum

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Hemianthus glomeratus

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Micranthemum glomeratum

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Cuba (HC)

Cuba (HC)

Micranthemum callitrichoides

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Hemianthus sp. "Amano Pearl Grass"

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Hemianthus sp. "Amano Pearl Grass"

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Hemianthus micranthemoides

Hemianthus micranthemoides

Hemianthus micranthemoides

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Hemianthus sp. "Göttingen"

Hemianthus sp. "Göttingen"

Hemianthus sp. "Göttingen"

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Hemianthus callitrichoides 'Cuba'

Hemianthus callitrichoides 'Cuba'

Hemianthus callitrichoides "Cuba"

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Lindernia anagallis

Lindernia anagallis

Lindernia anagallis

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Lindernia dubia

Lindernia dubia

Lindernia dubia

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Lindernia grandiflora

Lindernia grandiflora

Lindernia grandiflora

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Lindernia sp. 'India'

Lindernia sp. 'India'

Lindernia sp. 'India'

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Lindernia rotundifolia

Lindernia rotundifolia

Lindernia rotundifolia

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Lindernia rotundifolia 'Variegated'

Lindernia rotundifolia 'Variegated'

Lindernia rotundifolia 'Variegated'

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Recommended companions

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Ammannia latifolia

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Last updated: 06/16/2026
Micranthemum tweediei Care Guide & Tank Setup | Atlarium