Alternanthera reineckii is a popular freshwater aquarium plant belonging to the family Amaranthaceae. It's known for its striking red, purple, and pink hues, which make it a favorite among aquascapers seeking to add vibrant colors to their aquatic environments. Here’s an overview of the plant and its care requirements:
Characteristics
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Appearance: The plant features elongated leaves that vary in color from green to shades of red or purple, depending on the variety and lighting conditions.
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Growth Habit: It's a stem plant that can grow both emersed (above water) and submersed (underwater), though it's most commonly used in submerged aquascapes.
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Size: Can grow up to 12-20 inches tall in optimal conditions, with stems reaching several inches wide.
Care Requirements
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Lighting:
- High-intensity lighting is preferred to bring out the plant's vivid red colors.
- In low light, the colors may become dull, and growth will slow.
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Water Parameters:
- Temperature: 22–28°C (72–82°F)
- pH: 5.5–7.5
- Hardness: Soft to moderately hard water (2-12 dGH)
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CO₂:
- CO₂ supplementation is highly recommended for optimal growth and coloration, although the plant can survive without it under lower lighting.
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Nutrients:
- Requires a nutrient-rich substrate or water column fertilization.
- Regular dosing of iron and micronutrients helps maintain its vibrant coloration.
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Propagation:
- Easily propagated by cutting stems and planting the trimmings in the substrate.
- It develops roots quickly under proper conditions.
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Placement in Aquarium:
- Typically used as a mid-ground or background plant due to its height.
- Often grouped in clusters to create a striking focal point.
Popular Varieties
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Alternanthera reineckii 'Mini': A smaller version ideal for nano aquariums.
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Alternanthera reineckii 'Rosanervig': Known for its striking red-pink leaves with prominent veins.
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Alternanthera reineckii 'Lilacina': Features darker, purple-toned leaves.
Tips for Success
- Regular trimming prevents the plant from shading lower leaves.
- Combine with green plants for contrasting color in aquascapes.
- Avoid sudden changes in water parameters to prevent melting or stunted growth.
