Yokuchi Gen C – Liquid Carbon Fertilizer 400ml

The most efficient carbon fertiliser in the YOKUCHI range — 40,000 litres per bottle, immediately absorbed across the entire water volume.

YOKUCHI GEN C 400ml is a highly concentrated liquid carbon fertiliser in a large cylinder format with integrated dispenser. A single bottle treats up to 40,000 litres of aquarium water — in a 100-litre planted aquarium, one bottle lasts over 400 days.

Carbon is the fundamental building block of plant tissue, making up over 40% of plant dry mass — making it the single most important macroelement. In strongly lit, heavily planted tanks, natural CO₂ levels can drop to near-zero. Without supplementation, this causes slowed growth, complete growth arrest, and the proliferation of algae.

Why a Fully Saturated Concentrate?

An unsaturated liquid needs to dissolve before it can be absorbed. A fully saturated solution cannot absorb any more water — meaning every dose of YOKUCHI GEN C saturates the entire water volume immediately upon dosing. Plants absorb CO₂ through their leaves, not their roots.

Formula Highlights

• Organic carbon in its most easily absorbable form
• Can be used as a primary carbon source or as a supplement to CO₂ injection systems
• Regular use improves plant condition and prevents algae growth
• Fully saturated concentrate — immediately active across the entire water volume
• Exceptional yield — 40,000 litres per 400ml bottle
• Integrated dispenser for precise, consistent dosing

Dosing Instructions

1 click per 100 litres of water per day. Dose near the filter outlet for optimal distribution. For heavily planted aquariums, increase the dose proportionally to plant density.

Ideal For

Medium to large planted aquariums requiring regular carbon supplementation. The 400ml format offers exceptional value for regular use. Also available in the compact 30ml nano format for smaller tanks.

Part of the YOKUCHI precision fertiliser system, available at AquaScape Design.