Sunken Garden Liquid CO₂ Boost – Organic Liquid Carbon for Aquatic Plants | India

Sunken Garden Liquid CO₂ Boost is an organic liquid carbon source for planted aquariums — an easy alternative to a pressurised CO₂ system that supplies the carbon aquatic plants need for healthy growth, while also helping control algae. Just dose it daily into the water: it gives low-tech and nano tanks a carbon boost for fuller, greener growth without cylinders or regulators, and spot-dosing helps knock back problem algae. Shrimp-safe and made in India, it is the simplest way to give your plants more carbon.

What is Sunken Garden Liquid CO₂ Boost?

Short answer: A liquid carbon supplement that gives planted tanks a CO₂-style boost without a pressurised system.

Carbon is the nutrient plants need in the largest amount, and in most tanks it is the main factor limiting growth. A pressurised CO₂ rig is the gold standard but is costly and complex. Liquid carbon like Sunken Garden CO₂ Boost provides an accessible organic carbon source you simply dose into the water — ideal for low-tech and nano planted tanks. Note that liquid carbon is a carbon source, not a nutrient fertilizer, so you still dose a fertilizer alongside it; see our complete fertilizer guide.

Key Features

• Organic liquid carbon — a CO₂ alternative with no cylinders or regulators.
• Fuller, greener growth — more carbon for healthier plants.
• Algae control — spot-dosing helps knock back problem algae.
• Easy daily dosing — measure and pour, no equipment.
• Shrimp & fish safe — at the recommended dose.
• Made in India — affordable and reliably in stock.

Benefits

Immediate: An easy carbon boost from day one, with no CO₂ equipment.

Short-term: Fuller, greener growth and a useful tool against spot algae.

Long-term: A healthier low-tech planted tank without the cost and fuss of pressurised CO₂.

How It Works

Dosed into the water, liquid carbon provides a bioavailable carbon source that plants can use for photosynthesis and growth, supplementing the small amount of CO₂ naturally present in the tank. When spot-dosed onto problem algae, it also disrupts the algae. Use it alongside a complete fertilizer such as Sunken Garden Green, which supplies the nutrients carbon alone does not. Learn more in our best liquid fertilizer guide.

How to Use

1. Dose daily by your tank’s water volume, following the bottle label.
2. Add it with the lights on, near the filter outlet for good dispersal.
3. For spot algae, dose directly onto the affected area with the filter briefly off.
4. Continue dosing a complete fertilizer for nutrients.

Suitable For

• Low-tech and nano planted tanks without CO₂
• Hobbyists who want a carbon boost without equipment
• Tackling spot algae (e.g. on hardscape and slow-growing plants)
• Shrimp and community tanks (at label dose)

Not Ideal For

• As a replacement for nutrient fertilizer — it supplies carbon, not NPK or iron
• Certain sensitive plants (e.g. some vallisneria, mosses) which can react to liquid carbon — start low
• Large high-tech tanks better served by pressurised CO₂

Specifications

Problems It Solves

No CO₂ system: an easy carbon boost without equipment. Slow, leggy growth: more carbon for fuller plants. Spot algae: a targeted tool to knock it back. Complex setups: simple daily dosing.

Liquid CO₂ Boost vs Other Options

Expert Recommendation

For a low-tech or nano tank where pressurised CO₂ is overkill, liquid carbon is a great middle step. Dose Sunken Garden CO₂ Boost daily alongside a complete fertilizer like Sunken Garden Green for fuller growth, and start at the lower dose if you keep sensitive plants like vallisneria or mosses.

Frequently Asked Questions

What is liquid CO₂ / liquid carbon?

A liquid carbon source you dose into the tank to supplement CO₂ for plant growth, without a pressurised system.

Is liquid CO₂ a replacement for a CO₂ system?

It is an easier alternative for low-tech and nano tanks, but pressurised CO₂ still gives the strongest growth in demanding high-tech tanks.

Is it a fertilizer?

No — it supplies carbon, not nutrients. Dose a complete fertilizer alongside it for NPK and iron.

How often do I dose it?

Daily, by your tank’s water volume, following the label.

Does it control algae?

Yes — spot-dosing onto problem algae helps knock it back, and a carbon boost helps plants out-compete algae.

Is liquid CO₂ safe for shrimp and fish?

Yes at the recommended dose. Start low and avoid overdosing.

Can it harm my plants?

Some sensitive plants (certain vallisneria, mosses) can react to liquid carbon — start at a low dose to test.

When should I dose it?

With the lights on, when plants are photosynthesising, for best uptake.

Do I still need fertilizer?

Yes — carbon and nutrients are different. Use a complete fertilizer for the nutrients plants need.

Is it good for a nano tank?

Yes — it is ideal for nano and low-tech tanks where a CO₂ system is impractical.

Related Products & Guides

Pair with: Sunken Garden Green, Sunken Garden Vibrance. Alternative: Seachem Flourish Excel. Collections: Aquarium Fertilizer, Sunken Garden range, Planted Tank Setup. Guides: Best Liquid Fertilizer, Complete Fertilizer Guide.

Conclusion

Sunken Garden Liquid CO₂ Boost is the easy way to give a low-tech or nano planted tank more carbon for fuller, greener growth — plus a handy tool against spot algae. Dose it daily alongside a complete fertilizer, and enjoy healthier plants without the cost of a CO₂ system.