CO2 fertilization
CO₂ fertilization accelerates photosynthesis, plant growth, and color, reducing algae thanks to stronger plants. You can find complete kits, refillable/disposable cylinders, regulators, solenoid valves, diffusers/atomizers, bubble counters, drop checkers, and accessories.
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Typical configurations: refillable cylinder (economical in the long run), disposable (practical for small tanks), bio-CO₂ (entry-level). Key components: pressure regulator (dual gauge is better), solenoid valve for turning off at night, bubble counter, check valve, CO₂ tubing, and diffuser (in-tank or inline on the filter).
Target & adjustment: aim for 20–30 mg/L of CO₂ with a drop checker at 4 dKH solution (green/lime green when lights are on). Start with a few bubbles/minute and gradually increase until you see full growth without stressing the fish.
Good practices: turn on the CO₂ 1–2 hours before the lights and turn it off with a solenoid valve at the end of the photoperiod; limit surface turbulence and orient the filter output to diffuse CO₂ well. Maintain KH 3–6 for stable pH.
Safety & maintenance: always use a check valve, check for leaks (soap test), do not expose the cylinder to direct heat; periodically replace gaskets and clean the diffuser.
Alternative/integration: "liquid carbon" can supplement but not replace gaseous CO₂ in demanding tanks; check compatibility with shrimp and delicate plants.
Tip: Start with low CO2 dosage, observe fish and CO2 test, then increase gradually. With stable CO2 and consistent fertilization, plants will thrive over algae.
— Advice from the Hobby Pesca & Acquari Team
