Aquarium Co2 Indicator Solution Tester For Plant Growth And Fish Tank. Enhance Your Aquarium Environment with This Aquarium CO2 Indicator, Expertly Crafted to Monitor CO2 Levels for Optimal Plant Growth and Aquatic Health. With a 15ml Capacity, It Provides Accurate CO2 Readings, Ensuring Thriving Plants and Healthy Aquatic Life. Choose from Four Elegant Designs—Musical Note, Ball, Water Drop, and Hook—each Featuring Corrosion-resistant Glass for Both Style and Durability. The Indicator Solution Changes Color to Reflect CO2 Levels: - Blue: Low CO2, Slow Plant Growth. - Green: Ideal CO2, Perfect for Plant Photosynthesis and Aquatic Safety. - Yellow: High CO2, Potential Risk of Hypoxia for Fish and Shrimp. For Consistent Accuracy, Replace the Solution Monthly. Features: - Color-coded Liquid for Easy CO2 Level Indication. - Durable, Corrosion-resistant Glass Construction. - Available in Four Stylish Models. Package Includes: - 1 Bottle of Indicator Solution - Option for 1 Complete Set (Indicator + Solution).