Alternanthera reineckii, commonly known as Reineck’s Alternanthera or Amaranth, is a popular species of aquatic plant in the family Amaranthaceae. It’s commonly used in freshwater aquariums due to its striking appearance and ease of care. Here are some key details about this plant:

Appearance

• Leaf Color: The plant’s leaves are typically vibrant red to purple in color, with a deep, rich hue. This makes it a visually appealing addition to aquariums, especially in well-lit tanks.

• Leaf Shape: The leaves are lance-shaped, with a smooth surface and sometimes a slight serrated edge.

• Height: In aquariums, it can grow up to 20-30 cm (8-12 inches) tall, but with ideal conditions, it may grow even taller.

• Stem: The stem is usually red or purple, which complements the color of the leaves and adds further to its ornamental value.

Habitat

• Origin: It is native to South America, specifically regions like Brazil, where it grows in freshwater environments such as shallow streams and flooded areas.

• Water Requirements: It thrives in warm, soft water, typically in a pH range of 6.0 to 7.5 and a temperature between 22°C to 28°C (72°F to 82°F).

• Lighting: Alternanthera reineckii needs moderate to high lighting to maintain its vibrant color, especially its red or purple tones.

Growth and Care

• Propagation: It can be propagated through stem cuttings, which are often used to grow new plants. Simply trim the stem and replant the cutting in nutrient-rich substrate or float it until roots develop.

• Nutrient Needs: This plant requires a nutrient-rich substrate and regular dosing of micronutrients to flourish, particularly iron, which is essential for the red coloration.

• Maintenance: Regular pruning helps control its size and encourage bushier growth. It can sometimes be slow-growing, especially if light and nutrients are not optimal.

Uses

• Aquarium Aesthetics: Because of its colorful foliage, Alternanthera reineckii is often used as a foreground or midground plant in aquariums. Its unique color can contrast beautifully with green plants or aquatic species.

• Water Quality: Like many aquatic plants, it helps improve water quality by absorbing excess nutrients, contributing to a healthier aquarium environment.

Overall, Alternanthera reineckii is a great choice for aquarium hobbyists looking to add a pop of color and vibrancy to their setups, though it requires adequate care and attention to thrive.