Best No CO2 Aquarium Plants: 15 Species That Thrive Without CO2 Injection

Why Some Plants Don't Need CO2

All aquarium plants use CO2 for photosynthesis, but many species are efficient enough to pull dissolved CO2 from your tank water without supplemental injection. These "low-tech" plants have adapted to survive in environments with lower carbon availability — making them perfect for beginners and anyone who wants a beautiful planted tank without the complexity and cost of a CO2 system.

What Makes a Plant 'No CO2 Friendly'?

• Slow to moderate growth rate — they don't outpace available carbon
• Low light tolerance — reduces CO2 demand from photosynthesis
• Efficient carbon uptake — some species extract CO2 from the substrate through their roots
• Hardy genetics — evolved in low-nutrient environments

Top 15 No CO2 Aquarium Plants

1. Anubias Barteri

The king of no-CO2 tanks. Anubias grows slowly, tolerates virtually any lighting, and attaches to hardscape. Its thick, waxy leaves resist algae and fish damage. Simply tie or glue it to driftwood or rocks — never bury the rhizome in substrate.

Light: Low to medium | Growth: Slow | Placement: Foreground to midground

2. Java Fern (Microsorum pteropus)

Another rhizome plant that thrives without CO2. Java Fern comes in multiple varieties — narrow leaf, Windelov, trident — all equally hardy. Attach to hardscape and watch it slowly fill in with beautiful textured fronds.

Light: Low to medium | Growth: Slow | Placement: Midground to background

3. Java Moss (Taxiphyllum barbieri)

The most versatile moss in the hobby. Java Moss grows in almost any condition, attaches to surfaces naturally, and provides excellent cover for shrimp and fry. It can be used for moss walls, trees, and carpet effects.

Light: Low to medium | Growth: Moderate | Placement: Anywhere

4. Vallisneria (Jungle Val)

Need a dramatic background plant without CO2? Vallisneria sends up long, grass-like leaves that sway beautifully in the current. It propagates through runners and can fill the back of your tank within months. One of the fastest-growing no-CO2 options available.

Light: Low to high | Growth: Fast | Placement: Background

5. Cryptocoryne Wendtii

Crypts are the ideal midground plant for low-tech tanks. Cryptocoryne wendtii comes in green, red, brown, and bronze varieties. They grow from the substrate and rarely need trimming. Expect some "crypt melt" when first planted — the leaves will grow back stronger.

Light: Low to medium | Growth: Slow | Placement: Foreground to midground

6. Amazon Sword (Echinodorus bleheri)

A classic centerpiece plant that doesn't need CO2 to look stunning. Amazon Swords grow large — up to 20 inches — so they're best for tanks 20 gallons and up. Feed them with root tabs for the best growth.

Light: Medium | Growth: Moderate | Placement: Midground to background

7. Hornwort (Ceratophyllum demersum)

A floating or planted stem plant that grows like a weed — literally. Hornwort is nearly impossible to kill and absorbs nitrates like a sponge. It's the best natural water purifier you can add to a tank.

Light: Low to high | Growth: Very fast | Placement: Floating or background

8. Water Wisteria (Hygrophila difformis)

Beautiful lace-like leaves that look far more exotic than a no-CO2 plant should. Water Wisteria grows quickly, helps control algae by competing for nutrients, and propagates easily from cuttings.

Light: Medium | Growth: Fast | Placement: Midground to background

9. Dwarf Sagittaria (Sagittaria subulata)

Want a carpet without CO2? Dwarf Sagittaria is your best bet. It spreads through runners and creates a grass-like foreground. Under medium light, it stays short. Under low light, it stretches taller but still looks great.

Light: Low to medium | Growth: Moderate | Placement: Foreground

10. Marimo Moss Ball

The easiest plant in the hobby — it's literally a ball of algae that requires zero maintenance. Roll it occasionally to keep its round shape. Marimo absorbs nitrates and adds a unique visual element to any tank.

Light: Low | Growth: Very slow | Placement: Foreground

11. Floating Plants (Frogbit, Salvinia, Red Root Floater)

Floating plants are nature's CO2 hack — they pull CO2 directly from the air, so they never run short. They also shade the tank below, reducing algae. Amazon Frogbit, Salvinia, and Red Root Floater are all excellent choices.

Light: Medium to high | Growth: Fast | Placement: Surface

12. Bacopa Caroliniana

A hardy stem plant with round, succulent-like leaves. Bacopa grows slowly enough to not need constant trimming but fast enough to see progress. It even flowers above the waterline if given the chance.

Light: Low to medium | Growth: Moderate | Placement: Midground to background

13. Ludwigia Repens

Want red color without CO2? Ludwigia Repens is your answer. Under medium to high light, the leaves turn deep red to orange on top. It's one of the only red plants that performs reasonably well in low-tech setups.

Light: Medium to high | Growth: Moderate | Placement: Midground to background

14. Pogostemon Stellatus Octopus

An underrated no-CO2 option with narrow, wispy leaves that create beautiful texture. It grows tall and makes an excellent background accent plant. Propagate by cutting and replanting the tops.

Light: Medium | Growth: Moderate | Placement: Background

15. Water Sprite (Ceratopteris thalictroides)

Extremely fast-growing and adaptable — plant it in the substrate or let it float. Water Sprite produces baby plantlets on its leaves, making propagation effortless. It's one of the best nutrient absorbers for no-CO2 tanks.

Light: Low to high | Growth: Very fast | Placement: Background or floating

Tips for Success Without CO2

1. Use nutrient-rich substrate — aqua soil or add root tabs to inert substrates
2. Dose liquid fertilizer weekly — even without CO2, plants need nutrients
3. Keep lighting moderate — 6-8 hours per day, moderate intensity reduces algae
4. Add floating plants — they pull CO2 from air and reduce light for plants below
5. Stock fish appropriately — fish waste provides some CO2 and nutrients
6. Be patient — low-tech tanks grow slower but require far less maintenance

Shop No CO2 Plants at Canton Aquatics

Ready to build your low-tech planted tank? Browse our full collection of live aquarium plants — all shipped fresh with a live arrival guarantee. We carry every species on this list and ship Monday through Wednesday to ensure your plants arrive healthy.