Choosing the best live plants for 20 gallon tank is essential for creating a healthy, beautiful, and balanced aquatic environment. Live plants provide numerous benefits including oxygen production, natural filtration, and habitat for fish while enhancing the visual appeal of your aquarium. Selecting the right plants for your 20-gallon tank ensures a thriving underwater ecosystem that brings joy to both you and your fish.

A 20-gallon tank is a popular size for home aquariums, providing enough space for a variety of fish species while remaining manageable for maintenance. Live plants in a 20-gallon tank help maintain water quality by absorbing nitrates, providing shelter for fish, and reducing algae growth through competition for nutrients. Understanding which plants thrive in different light conditions and water parameters helps match the right species to your specific tank setup.

Quality live plants for a 20-gallon tank should be compatible with your lighting system, substrate type, and fish species. Some plants are easy to care for and grow well in low-light conditions, while others require more intense lighting and nutrient supplementation. Choosing appropriate plants prevents common issues like plant die-off, algae problems, or fish stress that compromise aquarium health and beauty.

In this guide, we will review the top 15 live plants ideally suited for 20-gallon aquariums, evaluating their care requirements, growth patterns, and overall value. We will also provide essential guidance on selecting and maintaining live plants for optimal aquarium health.

Top 15 Best Live Plants For 20 Gallon Tank

1. Java Fern (Microsorum pteropus) – Best Overall Live Plant For 20 Gallon Tank

Java Fern is one of the most popular and hardy aquatic plants for 20-gallon tanks, offering beautiful green foliage with minimal care requirements. This versatile plant can be attached to driftwood or rocks and does not require substrate. The slow growth and easy maintenance make it ideal for beginner and experienced aquarists alike.

Java Fern thrives in low to moderate light conditions and tolerates a wide range of water parameters. The plant reproduces by producing plantlets on the edges of older leaves, allowing for natural propagation. The attractive broad leaves provide excellent hiding places for fish and shrimp, making it a valuable addition to any community tank.

Attach Java Fern to driftwood or rocks using fishing line or aquarium-safe glue. Avoid burying the rhizome in the substrate, as this can cause rot. The plant prefers temperatures between 68-82°F and can tolerate pH levels from 6.0-7.5. Fertilize occasionally with a liquid aquarium fertilizer for optimal growth.

Pros:

• Very hardy and easy to grow
• Low light requirements
• No substrate needed
• Natural propagation
• Excellent fish hiding spots
• Slow, manageable growth
• Great for beginners

Cons:

• Slow growth rate
• Requires attachment to hardscape
• Rhizome cannot be buried

2. Anubias Nana (Anubias barteri var. nana) – Best Low-Light Plant For 20 Gallon Tank

Anubias Nana is a compact, hardy aquatic plant that thrives in low-light conditions, making it perfect for 20-gallon tanks. This slow-growing plant features dark green, thick leaves that are resistant to algae and fish damage. The small size makes it ideal for foreground and midground placement in smaller aquariums.

Anubias Nana tolerates a wide range of water conditions and requires minimal maintenance. The plant can be attached to driftwood, rocks, or left free-floating. The thick leaves provide excellent shelter for small fish and shrimp, and the plant is compatible with most freshwater fish species.

Attach Anubias Nana to hardscape using fishing line or aquarium glue. Keep the rhizome above the substrate to prevent rotting. The plant prefers temperatures between 72-82°F and pH levels from 6.0-7.5. Apply liquid fertilizer sparingly, as the plant is a slow grower.

Pros:

• Thrives in low light
• Very hardy and durable
• Compact size
• Resistant to algae
• Compatible with most fish
• Minimal maintenance
• Excellent for beginners

Cons:

• Very slow growing
• Can be expensive
• Rhizome must remain exposed

3. Amazon Sword (Echinodorus amazonicus) – Best Background Plant For 20 Gallon Tank

Amazon Sword is a stunning background plant that provides a dramatic focal point in a 20-gallon aquarium. This beautiful plant features long, sword-shaped leaves that create a lush, jungle-like appearance. The fast growth and impressive size make it ideal for filling background spaces in larger tanks.

Amazon Sword thrives in moderate to bright lighting with nutrient-rich substrate. The plant is a heavy root feeder and benefits from root tabs placed near its base. The broad leaves provide excellent hiding places for fish and contribute to a natural-looking aquascape.

Plant Amazon Sword in a nutrient-rich substrate and provide moderate to high lighting (2-3 watts per gallon). The plant prefers temperatures between 72-82°F and pH levels from 6.5-7.5. Add root tabs regularly to ensure healthy growth and consider CO2 supplementation for optimal results.

Pros:

• Dramatic background plant
• Fast growing
• Lush, jungle appearance
• Excellent fish shelter
• Nutrient uptake
• Easy propagation
• Natural aquascape look

Cons:

• Requires moderate to high light
• Needs nutrient-rich substrate
• Can outgrow smaller tanks

4. Cryptocoryne Wendtii – Best Midground Plant For 20 Gallon Tank

Cryptocoryne Wendtii is a versatile, hardy plant that adds texture and color to the midground of a 20-gallon aquarium. This plant features attractive crinkled leaves in shades of green, bronze, or brown. The adaptability and easy care make it popular for both beginner and experienced aquarists.

Cryptocoryne Wendtii tolerates a wide range of lighting conditions and water parameters. The plant grows well in low to moderate light, making it suitable for many tank setups. The attractive leaf colors and textures add visual interest to aquascapes.

Plant Cryptocoryne Wendtii in a nutrient-rich substrate and provide low to moderate lighting. The plant prefers temperatures between 72-82°F and pH levels from 6.5-7.5. Add root tabs occasionally to promote healthy growth and maintain stable water conditions.

Pros:

• Adaptable to various conditions
• Attractive leaf colors
• Hardy and easy to grow
• Good midground size
• Low to moderate light tolerance
• Natural propagation
• Versatile aquascaping

Cons:

• May melt when moved
• Slow grower
• Requires stable conditions

5. Java Moss (Taxiphyllum barbieri) – Best Versatile Plant For 20 Gallon Tank

Java Moss is one of the most versatile and popular aquatic plants, perfect for 20-gallon tanks. This undemanding moss can be used to create carpets, attach to driftwood, or provide hiding spots for fish and shrimp. The fast growth and easy maintenance make it ideal for aquascaping and breeding tanks.

Java Moss thrives in low to moderate light and tolerates a wide range of water parameters. The plant can grow in various shapes and forms, adapting to its environment. The dense growth provides excellent shelter for fish fry, shrimp, and other small aquatic creatures.

Attach Java Moss to driftwood, rocks, or mesh using cotton thread or aquarium glue. The plant prefers temperatures between 68-82°F and pH levels from 6.0-7.5. Trim regularly to maintain shape and promote healthy growth. Java Moss can also be used as a floating plant.

Pros:

• Very easy to grow
• Versatile applications
• Great for breeding tanks
• Low light tolerant
• Fast growing
• Excellent nutrient uptake
• Affordable

Cons:

• Can trap debris
• Requires regular trimming
• May spread rapidly

6. Dwarf Hairgrass (Eleocharis parvula) – Best Foreground Carpet Plant For 20 Gallon Tank

Dwarf Hairgrass is a popular foreground carpet plant that creates a beautiful, grassy lawn in 20-gallon aquariums. This slender, grass-like plant spreads through runners, forming a dense carpet over time. The bright green color and natural appearance make it a favorite for planted aquascapes.

Dwarf Hairgrass thrives in moderate to high lighting with CO2 supplementation for best results. The plant grows vertically and sends out runners horizontally, gradually forming a dense carpet. The grass-like appearance adds depth and dimension to aquarium landscapes.

Plant Dwarf Hairgrass in small clumps spaced 1-2 inches apart in a nutrient-rich substrate. Provide high lighting (3+ watts per gallon) and CO2 supplementation for optimal growth. The plant prefers temperatures between 68-78°F and pH levels from 6.0-7.5. Trim regularly to maintain carpet height.

Pros:

• Beautiful foreground carpet
• Natural grassy appearance
• Adds depth to aquascape
• Spreads through runners
• Good for aquascaping
• Bright green color
• Popular choice

Cons:

• Requires high light
• CO2 beneficial
• Slow to establish

7. Water Wisteria (Hygrophila difformis) – Best Fast-Growing Plant For 20 Gallon Tank

Water Wisteria is a fast-growing stem plant that adds lush greenery and texture to 20-gallon aquariums. This beautiful plant features delicate, fern-like leaves that create a soft, natural appearance. The rapid growth helps absorb excess nutrients, reducing algae problems in the tank.

Water Wisteria thrives in low to moderate light and tolerates a wide range of water conditions. The plant can be grown rooted in the substrate or left floating. The fast growth rate makes it ideal for filling empty spaces quickly and creating a natural, jungle-like appearance.

Plant Water Wisteria in a nutrient-rich substrate with moderate lighting. The plant prefers temperatures between 70-82°F and pH levels from 6.5-7.5. Prune regularly to maintain shape and encourage bushy growth. The plant can also be used as a floating plant for additional coverage.

Pros:

• Fast growing
• Excellent nutrient uptake
• Reduces algae
• Low light tolerant
• Versatile growth forms
• Easy to propagate
• Fills empty spaces

Cons:

• Requires regular pruning
• Can become invasive
• May drop leaves with changes

8. Marimo Moss Ball (Aegagropila linnaei) – Best Low-Maintenance Plant For 20 Gallon Tank

Marimo Moss Balls are unique, round algae balls that are incredibly easy to care for in a 20-gallon aquarium. These fascinating plants roll gently along the substrate, collecting debris and adding a whimsical touch. The low-maintenance nature makes them perfect for beginner aquarists.

Marimo Moss Balls thrive in low to moderate light and require minimal care. They help absorb nitrates and provide a natural environment for shrimp and small fish. The soft, fuzzy texture creates a unique visual element in the aquarium.

Place Marimo Moss Balls on the substrate and rotate them occasionally to maintain their round shape. The plant prefers temperatures between 68-82°F and pH levels from 6.0-7.5. Squeeze gently in aquarium water during water changes to keep them clean and healthy.

Pros:

• Extremely low maintenance
• Unique appearance
• Good nitrate absorption
• Safe for all fish
• No substrate needed
• Long-lasting
• Great for beginners

Cons:

• Slow growing
• Can become discolored
• Not a true plant

9. Hornwort (Ceratophyllum demersum) – Best Floating Plant For 20 Gallon Tank

Hornwort is a versatile, fast-growing plant that can be used as a floating plant or rooted in the substrate of a 20-gallon tank. This hardy plant features fine, feathery leaves that provide excellent hiding spots for fish and fry. The rapid growth makes it an excellent nutrient absorber and algae competitor.

Hornwort thrives in a wide range of lighting conditions and water parameters. The plant can be left floating, planted, or weighted down. The fine leaves provide excellent shelter for small fish and shrimp while absorbing excess nutrients from the water.

Float Hornwort on the surface or plant it in the substrate with moderate lighting. The plant prefers temperatures between 60-86°F and pH levels from 6.0-8.0. Trim regularly to prevent overgrowth and maintain the desired density.

Pros:

• Very easy to grow
• Excellent nutrient absorber
• Provides fish shelter
• Versatile planting options
• Fast growing
• Wide temperature tolerance
• Inexpensive

Cons:

• Can drop needles
• Requires regular trimming
• May block light

10. Dwarf Sagittaria (Sagittaria subulata) – Best Easy Foreground Plant For 20 Gallon Tank

Dwarf Sagittaria is an excellent foreground plant for 20-gallon tanks, creating a grassy carpet with minimal effort. This hardy plant spreads through runners, filling in empty spaces over time. The grass-like appearance adds natural beauty to the aquarium foreground.

Dwarf Sagittaria thrives in low to moderate light and tolerates a wide range of water parameters. The plant grows quickly once established and spreads readily through runners. The compact size makes it ideal for foreground and midground placement.

Plant Dwarf Sagittaria in a nutrient-rich substrate with low to moderate lighting. The plant prefers temperatures between 68-82°F and pH levels from 6.5-7.5. Trim runners as needed to maintain desired carpet density and prevent overgrowth.

Pros:

• Easy to grow
• Low light tolerant
• Spreads through runners
• Ideal foreground plant
• Hardy and adaptable
• Fast growth once established
• Natural appearance

Cons:

• May grow taller in low light
• Requires occasional trimming
• Slow to establish initially

11. Brazilian Pennywort (Hydrocotyle leucocephala) – Best Vine-Like Plant For 20 Gallon Tank

Brazilian Pennywort is a unique vine-like plant that adds a different texture to 20-gallon aquariums. This versatile plant can be grown as a ground cover, allowed to climb hardscape, or left floating on the surface. The attractive round leaves create a distinctive appearance in the aquascape.

Brazilian Pennywort thrives in low to moderate light and tolerates various water conditions. The plant can be used in multiple ways, making it a versatile addition to any aquascape. The fast growth helps absorb nutrients and provides shelter for fish.

Plant Brazilian Pennywort in the substrate, attach to hardscape, or float on the surface. The plant prefers temperatures between 68-82°F and pH levels from 6.5-7.5. Prune regularly to control growth and encourage bushiness.

Pros:

• Versatile growth forms
• Unique appearance
• Fast growing
• Easy to care for
• Good nutrient uptake
• Attractive foliage
• Adaptable to various uses

Cons:

• Can grow aggressively
• Requires regular trimming
• May block light for others

12. Red Root Floater (Phyllanthus fluitans) – Best Floating Plant For 20 Gallon Tank

Red Root Floater is a stunning floating plant that adds vibrant color and texture to 20-gallon aquariums. This plant features small, round leaves on the surface with distinctive red roots hanging below. The beautiful appearance and easy care make it a popular choice for open-top tanks.

Red Root Floater thrives in moderate to bright light and prefers calm water conditions. The red coloration develops under higher light, adding vibrant color to the tank. The plant provides excellent cover for fish and helps absorb excess nutrients.

Float Red Root Floater on the surface with moderate to high lighting. The plant prefers temperatures between 70-82°F and pH levels from 6.0-7.5. Remove excess growth regularly to prevent covering the entire surface and blocking light for other plants.

Pros:

• Stunning red coloration
• Beautiful surface plant
• Good nutrient uptake
• Provides fish cover
• Easy care
• Unique appearance
• Ideal for open-top tanks

Cons:

• Requires moderate to high light
• Needs calm water
• Can block light for below

13. Banana Plant (Nymphoides aquatica) – Best Unique Plant For 20 Gallon Tank

The Banana Plant is a fascinating, unique aquatic plant that features banana-shaped roots and attractive lily-pad leaves. This plant creates a distinctive, tropical appearance in 20-gallon aquariums. The unusual root structure and floating leaves make it a conversation piece in any planted tank.

Banana Plants thrive in low to moderate light and are relatively easy to care for. The plant produces beautiful round leaves that float on the surface or grow to the surface from the substrate. The distinctive root system is the plant’s main identifying feature.

Plant Banana Plant in the substrate with the banana-shaped roots partially exposed. The plant prefers temperatures between 68-82°F and pH levels from 6.0-7.5. Provide moderate lighting and remove any decayed leaves to maintain plant health.

Pros:

• Unique appearance
• Conversation piece
• Easy to grow
• Low to moderate light
• Floating surface leaves
• Interesting root structure
• Great for beginners

Cons:

• Can be expensive
• Slower growing
• May not flower in aquarium

14. Rotala Rotundifolia – Best Colorful Stem Plant For 20 Gallon Tank

Rotala Rotundifolia is a stunning stem plant that adds vibrant color and vertical interest to 20-gallon aquariums. This beautiful plant features delicate leaves that can turn pink, red, or orange under high lighting. The graceful growth habit makes it ideal for background and midground placement.

Rotala Rotundifolia thrives in moderate to high lighting with CO2 supplementation for optimal color development. The plant grows quickly and provides excellent nutrient uptake. The beautiful colors add visual interest and depth to planted aquascapes.

Plant Rotala Rotundifolia in a nutrient-rich substrate with moderate to high lighting. The plant prefers temperatures between 72-82°F and pH levels from 6.0-7.5. Add CO2 supplementation for best color and growth. Trim regularly to maintain shape and encourage bushiness.

Pros:

• Beautiful colorful foliage
• Adds depth to aquascape
• Fast growing
• Good nutrient uptake
• Versatile placement
• Striking appearance
• Popular choice

Cons:

• Requires high light for color
• CO2 beneficial
• Requires regular trimming

15. Vallisneria Spiralis – Best Easy Background Plant For 20 Gallon Tank

Vallisneria Spiralis is a tall, grass-like plant that creates a beautiful, natural background in 20-gallon aquariums. This hardy plant features long, spiral leaves that sway gracefully in the current. The fast growth and easy care make it perfect for beginner and experienced aquarists.

Vallisneria Spiralis thrives in low to moderate light and tolerates a wide range of water parameters. The plant spreads through runners, gradually filling the background of the tank. The graceful, swaying leaves create a natural, dynamic appearance.

Plant Vallisneria Spiralis in a nutrient-rich substrate with low to moderate lighting. The plant prefers temperatures between 72-82°F and pH levels from 6.5-7.5. Add root tabs to promote healthy growth and trim the runners as needed to control spread.

Pros:

• Very easy to grow
• Beautiful background plant
• Graceful swaying leaves
• Spreads through runners
• Low to moderate light
• Hardy and adaptable
• Great for beginners

Cons:

• Can grow very tall
• May need trimming
• Can spread aggressively

7 Essential Tips For Growing Live Plants In A 20 Gallon Tank

• Match plants to your lighting: Assess your aquarium’s lighting intensity and choose plants accordingly. Low-light plants like Java Fern, Anubias, and Cryptocoryne are ideal for standard LED setups. High-light plants like Dwarf Hairgrass and Rotala require stronger lighting (2-3+ watts per gallon) for optimal growth.
• Use appropriate substrate: Choose the right substrate for your plants’ needs. Root-feeding plants like Amazon Sword and Vallisneria benefit from nutrient-rich substrates or root tabs. Rhizome plants like Java Fern and Anubias need attachment to hardscape and should not be buried.
• Maintain proper water parameters: Most aquarium plants thrive in water temperatures between 72-82°F and pH levels between 6.0-7.5. Maintain stable conditions and perform regular water changes to prevent nutrient buildup that can harm plants and fish.
• Provide nutrients: Supplement with liquid fertilizers for water column-feeding plants and root tabs for root-feeding plants. A balanced fertilizer regime ensures healthy growth and vibrant colors. Consider CO2 supplementation for higher-light setups to maximize plant growth.
• Choose compatible fish: Select fish species that are compatible with live plants. Avoid fish that dig or eat plants excessively. Peaceful community fish like tetras, rasboras, and small catfish are generally plant-safe and complement planted aquascapes.
• Plan plant placement: Arrange plants with consideration for their mature size and growth habits. Place taller background plants in the back, midground plants in the middle, and foreground plants in the front. Consider the light and flow requirements of each species.
• Perform regular maintenance: Trim plants regularly to maintain desired shape and prevent overgrowth. Remove dead or decaying leaves promptly to maintain water quality. Clean plant leaves of debris and algae during water changes for optimal health.

Frequently Asked Questions About Live Plants For 20 Gallon Tank

1. What are the easiest live plants for a 20 gallon tank?

Java Fern, Anubias Nana, Marimo Moss Balls, and Java Moss are among the easiest live plants for a 20-gallon tank. These hardy plants thrive in low-light conditions, require minimal maintenance, and tolerate a wide range of water parameters, making them ideal for beginners.

2. How many live plants should I put in a 20 gallon tank?

A 20-gallon tank typically accommodates 10-15 plants, depending on their mature size and growth habit. A well-planted aquarium includes background, midground, and foreground plants arranged in layers. Avoid overcrowding, as plants need space to grow and fish need swimming room.

3. Can I put live plants in a tank with gravel?

Yes, you can grow live plants in a tank with gravel, but root-feeding plants may need root tabs for nutrients. Rhizome plants like Java Fern and Anubias attach to hardscape and don’t require substrate. Choose plants suited to your substrate type for best results.

4. Do live plants help keep aquarium water clean?

Yes, live plants significantly improve water quality by absorbing nitrates and other nutrients, producing oxygen, and competing with algae. A well-planted tank requires less frequent water changes and provides a healthier environment for fish and other aquatic life.

5. What lighting is best for plants in a 20 gallon tank?

Lighting requirements vary by plant type. Low-light plants need 10-20 lumens per liter (1-2 watts per gallon), moderate-light plants need 20-40 lumens per liter (2-3 watts per gallon), and high-light plants need 40+ lumens per liter (3+ watts per gallon). Choose lighting based on your plant selection.

6. Can I keep live plants with all fish species?

While many fish species are compatible with live plants, some fish may dig, eat, or uproot plants. Avoid large cichlids, silver dollars, and goldfish in planted tanks. Peaceful community fish like tetras, rasboras, guppies, and small catfish are excellent choices for planted aquariums.

7. Do I need CO2 for plants in a 20 gallon tank?

CO2 supplementation is beneficial but not mandatory for many low to moderate-light plants. High-light setups with demanding plants like Dwarf Hairgrass and Rotala benefit from CO2 injection. Start with easy plants without CO2 and add supplementation as you gain experience.

Conclusion

In conclusion, selecting the best live plants for 20 gallon tank creates a beautiful, healthy, and balanced aquatic environment that benefits both fish and aquarist. Java Fern earned our top recommendation for its hardiness, versatility, and ease of care that makes it perfect for beginners and experienced aquarists alike. Anubias Nana emerged as the runner-up for its compact size, low-light tolerance, and attractive foliage that adds beauty to any planted aquarium.

Each plant reviewed above offers unique benefits tailored to specific lighting conditions, placement preferences, and aquascaping goals. Consider your lighting system, substrate type, and fish species when making your selection. The right live plants create a thriving underwater ecosystem that enhances your aquarium’s beauty and your enjoyment.

Investing in quality live plants for your 20-gallon aquarium enhances water quality, provides natural habitat for fish, and creates lasting beauty. Proper plant selection, regular maintenance, and appropriate care ensure your aquarium remains healthy and vibrant for years to come. The modest investment in live plants returns significant dividends in aquarium health, beauty, and enjoyment.

Ready to transform your 20-gallon aquarium with the best live plants? Choose from our recommended options above and experience the difference in aquarium health and beauty. Start planting today and enjoy a thriving underwater garden that impresses family and friends.