The short answer
Absolutely. Many of the best-loved aquarium plants are low-tech — they grow well with just decent light and a little fertiliser, no CO2 system at all. The trick is choosing the right plants: Anubias, Java fern, Cryptocoryne, mosses and many stems thrive without CO2. What you can’t do without CO2 is grow the demanding carpets and red plants that depend on it.
The reliable no-CO2 plants
These grow in almost any tank with moderate light:
- Anubias and Anubias nana — tough rhizome plants, tie to hardscape.
- Java fern — near indestructible, low light is fine.
- Cryptocoryne wendtii — colourful rosette, roots in the substrate.
- Java moss and other mosses — carpet or attach anywhere.
- Amazon sword — big background plant, loves root tabs.
For a no-CO2 foreground, dwarf sagittaria is the easiest carpet — see the easiest carpet plants.
What still needs CO2
Injected CO2 is what makes high-light tanks, tight carpets like dwarf baby tears, and vivid red stems possible. Under strong light plants burn through dissolved CO2 fast, and without a supply they stall and algae takes over. If that’s the look you want, read CO2 for beginners and the CO2 hub.
Keep it balanced
Because low-tech plants grow slowly, dose gently and don’t over-light. See do I need CO2 and how much light plants need for the balance that keeps a no-CO2 tank green and algae-free.