How to Care for Low-Light Aquatic Houseplants

Aquatic houseplants add beauty and tranquility to indoor spaces while requiring minimal maintenance. If you have a low-light environment, choosing the right aquatic plants and understanding their care needs will ensure they thrive. Here’s a complete guide to keeping low-light aquatic houseplants healthy and vibrant.

1. Choose the Right Low-Light Aquatic Plants

Not all aquatic plants can survive in low-light conditions, but several species thrive with minimal lighting. Some great options include:

• Anubias – Hardy and slow-growing, ideal for low-light setups.
• Java Fern (Microsorum pteropus) – Tolerates dim conditions and grows well attached to driftwood or rocks.
• Marimo Moss Balls – Unique and easy to maintain, they thrive in low light.
• Cryptocoryne – Comes in various colors and shapes, perfect for shaded environments.
• Hornwort (Ceratophyllum demersum) – A floating plant that adapts well to low light.

2. Provide the Right Lighting Conditions

Even low-light plants need some light to grow. If your room has very little natural light, consider:

• Using low-wattage LED or fluorescent lights designed for aquatic plants.
• Providing indirect sunlight for a few hours daily if possible.
• Avoiding strong, direct light, which can promote algae growth.

3. Maintain Proper Water Conditions

Water quality is crucial for aquatic plant health. Follow these guidelines:

• Use dechlorinated water – Tap water contains chlorine, which can harm plants. Let it sit for 24 hours or use a water conditioner.
• Monitor water temperature – Most low-light aquatic plants prefer temperatures between 68°F and 78°F (20°C–26°C).
• Change water regularly – Replace 20–30% of the water weekly to prevent buildup of waste and algae.

4. Use the Right Substrate and Anchoring Methods

Some aquatic plants need specific substrates, while others do well attached to surfaces.

• Gravel or sand – Works well for rooted plants like Cryptocoryne.
• Driftwood or rocks – Anubias and Java Fern attach best to hard surfaces rather than being planted in soil.
• No substrate needed – Marimo Moss Balls and floating plants like Hornwort don’t require planting.

5. Provide Nutrients for Healthy Growth

Low-light plants grow slowly, but they still need nutrients to thrive. Consider:

• Liquid fertilizers – Use a mild aquarium plant fertilizer once or twice a month.
• Root tabs – For plants with roots, these slow-release fertilizers provide essential nutrients.
• Fish waste – If your plants share space with fish, their waste naturally provides some nutrients.

6. Prevent and Control Algae Growth

Low light reduces the risk of algae, but it can still develop. Keep algae under control by:

• Keeping light exposure under 8 hours per day.
• Adding algae-eating fish or snails, such as Nerite snails or Amano shrimp.
• Regularly wiping off algae from plant leaves and tank surfaces.

7. Prune and Maintain Plants Regularly

Trimming plants helps maintain their shape and health.

• Remove dead or yellowing leaves.
• Trim overgrown roots and stems as needed.
• Gently clean leaves if they collect debris or algae.

Low-light aquatic houseplants are an excellent choice for indoor spaces with minimal sunlight. By selecting hardy species, maintaining clean water, and providing occasional nutrients, you can enjoy a beautiful, low-maintenance aquatic plant setup. Whether in a planted aquarium, terrarium, or decorative water bowl, these plants will enhance your space while requiring little effort.

Would you like recommendations on specific plant setups? Let me know!