Best easy aquarium plants without CO2 for beginners
Not every aquarium plant needs CO2 supplementation to grow well. Here's a selection of hardy plants suited to beginners who want a planted tank without investing in a carbon dioxide injection system. The toys and enrichment category gathers all our decor guides.
Why do some plants not need CO2?
Slow-growing plants, or those able to draw on the carbon naturally dissolved in the water, don't need artificial enrichment. Their more frugal metabolism lets them get by on light and the nutrients supplied by fish waste.
Which easy plants work well without CO2?
- Anubias: very slow-growing and nearly indestructible, attaches to driftwood or rock instead of being planted in substrate.
- Java fern: tolerates low light and grows without any special nutrient-rich substrate.
- Cryptocoryne: adapts to a wide range of water conditions, with discreet roots and moderate growth.
- Vallisneria: a fast-growing background plant that already thrives on the nitrogen naturally present once the tank has cycled.
What lighting suits these plants best?
Moderate LED lighting, like the options covered in our LED aquarium lighting guide, is more than enough for these low-demand species, without risking algae growth from excess power.
Do you still need liquid fertilizer?
An occasional dose of low-phosphate liquid fertilizer can speed up growth, but stays optional: a study by Barko and Smart, published in 1981 in Ecological Monographs, shows that light and temperature influence submersed macrophyte growth more than carbon availability alone, which explains why well-tuned lighting is often enough for these hardy plants (study on Google Scholar). Our guide on fertilizer and CO2 in aquariums covers the cases where enrichment becomes worthwhile.
Frequently asked questions
Do these plants suit a freshly cycled tank?
Yes, they tolerate the still-unstable parameters of a young tank well, unlike more demanding species.
Can natural and artificial plants be combined?
Absolutely, our comparison of live versus artificial plants helps you balance the mix based on budget and maintenance time.
Do these plants really limit algae?
They consume some of the available nitrates, reducing the resource algae feed on, though they don't replace regular maintenance. Browse all our guides on the fish hub.
This guide is part of Planète Pets’s Fishkeeping universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.