Care sheet for Hygrophila siamensis, a popular aquatic plant species often referred to as "Giant Hygrophila" or "Hygrophila corymbosa":
Species: Hygrophila siamensis
 
Common Names: Giant Hygrophila, Hygrophila corymbosa
Difficulty Level: Easy to Moderate
Lighting Requirements: Moderate to High (at least 2-3 watts per gallon of aquarium lighting)
CO2 Requirements: Not strictly required, but beneficial. Can grow well in low CO2 setups, but may benefit from supplemental CO2 in higher light setups.
Water Parameters:
Temperature: 72-82°F (22-28°C)
pH: 6.0-8.0
Hardness: Soft to moderately hard water (2-10 dKH)
Plant Placement: Background or Mid-ground
Propagation: Cuttings or side shoots
Care Tips:
Lighting: Provide moderate to high lighting for optimal growth and coloration. Avoid placing Hygrophila siamensis in shaded areas of the aquarium, as it may lead to leggy growth and less vibrant leaves. Consider using full-spectrum LED or fluorescent lights with a color temperature around 6500K for best results.
CO2: While Hygrophila siamensis can grow without CO2 supplementation, providing supplemental CO2 can promote faster growth and more vibrant coloration. CO2 injection can be especially beneficial in high light setups or when aiming for more intense growth.
Water Parameters: Hygrophila siamensis is a relatively adaptable plant that can tolerate a wide range of water parameters. However, it generally prefers slightly acidic to neutral pH and soft to moderately hard water. Keep the water clean and well-aerated, and perform regular water changes to maintain optimal water quality.
Substrate: Provide a nutrient-rich substrate to promote healthy root growth. Hygrophila siamensis can benefit from a nutrient-rich substrate such as aquarium soil, clay-based substrate, or nutrient-rich gravel. You can also add root tabs or liquid fertilizers to provide essential nutrients like nitrogen, phosphorus, and potassium.
Pruning and Propagation: Regular pruning can help maintain a neat appearance and encourage bushier growth. Trim any yellow or damaged leaves and trim the stems to the desired height using sharp aquarium scissors. Hygrophila siamensis can propagate through cuttings or side shoots, which can be replanted in the substrate to create new plants.
Placement: Hygrophila siamensis can be used as a background or mid-ground plant in the aquarium. It grows tall and bushy, making it ideal for filling in the back or sides of the tank. Consider planting it in groups or clusters for a denser appearance.
With proper care, Hygrophila siamensis can thrive and add a lush, green, and vibrant touch to your aquarium. Regular pruning, appropriate lighting, and nutrient supplementation, if needed, will help ensure healthy growth and stunning appearance for this beautiful aquatic plant species.