Why Consider CO₂ Injection in a Nano Aquarium?
Even in a small tank, CO₂ plays a key role in photosynthesis and plant growth. Injecting CO₂ in a nano aquarium can:
- Stimulate growth of carpet plants or demanding species.
- Improve tank aesthetics (dense plant carpet, more colorful red plants).
- Stabilize parameters (better oxygenation during the day).
Risks Specific to Small Volumes
A nano aquarium has very low chemical inertia. A small dosing error can quickly destabilize the balance:
- Overdose: even a few extra bubbles can dangerously drop pH.
- Rapid fluctuations: small tanks react quickly to any changes (lighting, temperature, CO₂).
- Low margin for error: poor diffusion can affect sensitive fish and shrimp.
Which CO₂ System for a Nano Aquarium?
For very small volumes, there are specific systems:
- DIY kit (yeast/sugar): cheap but unstable and imprecise.
- Disposable cartridge with mini regulator: compact, easy to install, good compromise.
- Passive diffuser (CO₂ tablets or gel type): simple, for beginners or undemanding plants.
Tips for Safe Injection
Here are good practices to avoid risks in a small tank:
- Use an ultra-precise bubble counter (0.5 to 1 bubble per second max).
- Add a drop checker to visually check CO₂ levels.
- Install a solenoid valve to stop diffusion at night.
- Regularly monitor pH and behavior of shrimp/fish.
Alternatives to Injected CO₂
- Use easy plants: Java moss, Anubias, Cryptocorynes.
- Limit lighting: moderate light = less CO₂ needed.
- Complete liquid fertilizers: may suffice without active injection.
In summary: injecting CO₂ in a nano aquarium is not mandatory but can bring real benefits if well controlled. It requires precision, monitoring, and equipment adapted to small volumes.