Ranunculus hederaceus, commonly known as Ivy-leaved Water Crowfoot, is a small, delicate aquatic plant that belongs to the Ranunculaceae family. It is native to Europe and Asia and is known for its attractive foliage and small, yellow flowers.

Here is a detailed description and care guide for Ranunculus hederaceus:

Description:

Appearance: Ranunculus hederaceus has small, rounded leaves that resemble the shape of ivy leaves. The leaves are typically bright green and can float on the water surface or grow submerged, depending on the water depth. The plant forms dense mats or carpets of foliage.
Flowers: It produces small, yellow flowers with five petals. The flowers have a bright and cheerful appearance and can appear throughout the growing season. They add a splash of color to the aquatic environment.

Size: The size of Ranunculus hederaceus can vary depending on the growing conditions. On average, the plant reaches a height of 1 to 3 inches (2.5 to 7.5 centimeters), forming dense carpets of foliage.
Care Guide:

Lighting: Ranunculus hederaceus prefers moderate to high lighting levels. Provide at least 2 to 3 watts per gallon of light intensity to ensure healthy growth. Use full-spectrum bulbs or LED lights specifically designed for aquatic plant growth.

Water conditions: This plant thrives in slightly acidic to slightly alkaline water conditions with a pH range of 6.5 to 7.5. It can tolerate a wide range of water hardness but generally prefers moderately soft to moderately hard water. Maintain a water temperature between 68°F (20°C) and 82°F (28°C).

Substrate: Ranunculus hederaceus can grow in various substrates, including sand, gravel, or even bare-bottom tanks. However, a fine-grained substrate or a nutrient-rich substrate can provide better anchorage for the plant's roots and promote healthier growth.
CO2 and nutrients: Ranunculus hederaceus can grow in low to medium CO2 levels, but supplementing with additional CO2 can enhance growth and vitality. Regular fertilization with a comprehensive aquatic plant fertilizer will ensure the plant receives necessary nutrients.

Maintenance: Trim the plant regularly to prevent it from becoming too dense and to promote new growth. Gently remove any dead or decaying leaves to maintain the overall health and appearance of the plant. Monitor and control algae growth to prevent it from overtaking the carpet.

Propagation: Ranunculus hederaceus reproduces through runners or stolons that spread across the substrate. The plant forms new plantlets along the runners, which can be separated and replanted to propagate the species.
Overall, Ranunculus hederaceus is a charming addition to aquariums and planted tanks, with its ivy-like leaves and bright yellow flowers. With proper care and maintenance, it can form lush carpets and provide a natural and attractive appearance to the aquatic environment.