An appropriate amount of CO2 added to water can promote the photosynthesis of aquatic plants and make them grow quickly. The colorful leaves are thick and thick, and the tiny elemental C02 bubbles are brought to the aquatic plants’ leaves by the water flowLet the water plant directly absorb free CO2. This item is a set of CO2 for fish tank. The bubbles are fine and uniform, 360 degree and will take less space. Feature - ColorWhite - Material: Acrylic. - Size: About 25 x 1.8 x 5cm. - The bubbles are fine and uniform, don’t worry about wasting CO2 gas. - 360 degree can refine the gas, great refining efficiency. - Do not occupy the space of tank, simple and mini appearance. - Transparent acrylic material, visual effect is good, safe and more durable. - Long-term use is not easy to be blocked by algae, easy to clean. Package list: 3 x Set of CO2