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Hornwort (Ceratophyllum demersum) is a popular and versatile aquarium plant known for its fast growth and low-maintenance requirements. Here are care requirements for hornwort in your aquarium:

**1. Lighting:**
- Hornwort is adaptable to various lighting conditions. It can thrive in low to high light setups. However, it tends to grow more densely in higher light.

**2. Substrate:**
- Hornwort is a floating plant, and it doesn't require substrate planting. However, you can anchor it to the substrate or let it float freely in the water.

**3. CO2 Injection:**
- Hornwort can grow well without additional CO2 supplementation. It absorbs carbon dioxide directly from the water.

**4. Fertilization:**
- Hornwort is not a heavy feeder, and it can absorb nutrients from the water. However, providing a balanced liquid fertilizer can promote healthier growth, especially in setups with lower nutrient levels.

**5. Water Parameters:**
- Hornwort is adaptable to a wide range of water conditions.
- Temperature: 59-86°F (15-30°C)
- pH: 6.0-7.5
- Hardness: Soft to hard water is acceptable.

**6. Water Flow:**
- Hornwort can tolerate gentle to moderate water flow. Avoid strong currents that might displace floating portions.

**7. Placement:**
- Hornwort can be left floating or anchored. If anchoring, you can use weights to keep it in place or let it naturally anchor to decorations or substrate.

**8. Pruning:**
- Hornwort doesn't require regular pruning, but you can trim it to control its size or to encourage branching. Trim the stems using clean scissors or your fingers.

**9. Tank Mates:**
- Hornwort is compatible with various aquarium inhabitants. It provides cover for fish and fry and contributes to a natural-looking environment.

**10. Algae Control:**
- Hornwort can help with algae control by outcompeting algae for nutrients. However, maintaining good aquarium hygiene is essential to prevent algae issues.

**11. Oxygenation:**
- Hornwort contributes to oxygenation by releasing oxygen during photosynthesis. It can be beneficial in tanks with lower oxygen levels.

**12. Propagation:**
- Hornwort can propagate through stem fragmentation. Simply cut a portion of the stem and let it float or anchor it to propagate new plants.

**13. Pests:**
- Occasionally check for pests, snails, or debris within the plant. Keeping the plant clean contributes to its overall health.

Hornwort is a hardy and adaptable plant, making it suitable for both beginner and experienced aquarists. Its rapid growth and ability to absorb excess nutrients make it a valuable addition to freshwater aquariums.