A lack of a carbon source is one of the main causes of poor plant growth in aquariums. API CO2 BOOSTER adds essential liquid carbon to planted aquariums, fuelling the photosynthetic process and turn light energy into new plant growth. It supplies simple carbon compounds, and slowly releases CO2 to aquarium plants. For best results use in conjunction with API LEAF ZONE liquid plant fertilizer and API ROOT TABS fertilizer for optimal plant growth. Use daily.