CO₂ Myths: What Most Fishkeepers Get Wrong

When scrolling through Instagram aquascapes, it’s easy to believe that every planted tank needs CO₂ injection. But as DALUA Fishroom explains in their latest video, that assumption is often wrong.

In fact, many aquariums thrive without CO₂, especially those with hardy plants like crypts, Java fern, Anubias, and mosses. Before investing in regulators, diffusers, and indicator kits, it’s worth understanding what CO₂ actually does—and when it’s unnecessary.

Key Takeaways from the Video

Low-tech tanks thrive without CO₂ if lighting and fertilisers are dialed in.

Plants need proper light and nutrients first before CO₂ makes a difference.

Too much CO₂ stresses fish, making them unhealthy.

Safe measurement is critical if you do choose to run CO₂.

Budget wisely—many aquarists waste money on systems they don’t need.