Micranthemum ‘Monte Carlo’

Usual aquarium appearance

This small plant has small rounded leaves on creeping, rooting stems. Its common colour is bright green. Leaf height, density, and colour can change with light, CO₂, nutrients, water depth, trimming, and the individual plant.

Fine stems creep along or just above the substrate and root at their nodes.

It is normally used for forgiving foreground carpets and growth cascading over stone or wood. During the first few weeks, watch for firm crowns, fresh roots, runners, creeping tips, or new submerged leaves rather than expecting immediate coverage.

Essentials

• Start with medium light, increased only after the plant is rooted and growing.
• Use a fine planted substrate or inert fine gravel with suitable root nutrition.
• Provide gentle circulation that does not uproot small portions.
• Use a complete fertiliser carefully when the aquarium does not already provide enough nutrients.
• Keep water conditions and temperature stable instead of chasing one exact number.
• An established aquarium is preferred because new carpets are vulnerable to algae and disturbance.

Optional improvements

• Stable injected CO₂ can improve rooting, runner production, density, and recovery.
• Small planting portions spaced apart usually establish more evenly than one thick clump.
• Regular gentle cleaning prevents debris from settling inside a carpet.

Beginner setup checklist

• Cycled, filtered freshwater aquarium
• Fine substrate suitable for small roots
• Stable light schedule
• Gentle water movement
• Consistent fertilising
• Fine planting tweezers and sharp scissors
• Fish that will not dig or uproot the foreground

CO₂ guidance

Injected CO₂ is recommended for reliable compact or carpeting growth, but it is not automatically required. Stable CO₂ can improve runner production, rooting, density, leaf form, and recovery after planting or trimming.

Keep CO₂ steady and balance it with light, complete nutrition, circulation, and oxygen. Do not raise light sharply before the plant is producing healthy new growth.

Preparation

• Remove pots, foam, metal bands, and rock wool.
• Rinse the roots and remove fully damaged or decaying tissue.
• For tissue culture, wash away all gel.
• Divide the plant into small plugs or natural clumps.

Planting a carpet

• Use fine tweezers to insert each plug shallowly into the substrate.
• Keep healthy leaves and creeping tips above the substrate.
• Space portions a few centimetres apart rather than planting one thick bunch.
• Plant slightly deeper only when necessary to prevent lifting, without burying the whole plant.

Attachment does not normally apply

This plant should be rooted in substrate and allowed to spread through runners, rhizomes, stolons, or creeping stems. Do not glue crowns, roots, or carpet plugs to hardscape.

Carpet trimming

• Use clean, sharp scissors and trim a thin upper layer after the plant is firmly rooted.
• Remove loose cuttings immediately with a net or siphon.
• Thin dense or lifted sections so the lower layer does not become shaded and decay.
• Do not cut a newly planted or melting carpet heavily.
• Healthy trimmings with nodes or roots may be replanted when appropriate.

Light, regular trimming encourages branching and keeps a carpet low. A very thick untrimmed mat may lift away from the substrate.

Propagation by cuttings, stolons, or divided plugs

• Select a healthy rooted or actively growing section.
• Cut or separate a small plug with leaves and nodes.
• Plant it shallowly with the growing tips exposed.
• Keep flow gentle until the new portion anchors.

Propagate only healthy growth. Allow recently imported, melting, or algae-covered plants to recover first.

Normal adjustment

Transport, planting, and conversion from nursery growth can cause temporary melting, pale leaves, or slow spreading.

• Normal signs include firm crowns, fresh white roots, new runners, creeping tips, or newly formed submerged leaves.
• Emersed-grown leaves may melt while new submerged growth develops.
• Colour and height may change over several weeks.

Signs needing attention

• Soft crowns, transparent new growth, repeated loss of every new runner, or spreading decay.
• A carpet lifting from the substrate because the lower layer has died.
• Heavy algae or debris covering new growth.
• Repeated uprooting by fish, shrimp maintenance, or excessive direct flow.

The aquarium trade commonly uses Micranthemum tweediei 'Monte Carlo'. The current Kew backbone treats Micranthemum tweediei as a synonym of Micranthemum umbrosum.