Fangrui Product Details Our Fish Tank Water Purification Tablets Contain Water Purifiers And Coagulins. It Can Quickly Eliminate Cloudy Substances From Aquarium Water, Ensure A Clear And Safe Environment For Your Aquatic Pets, And Keep Your Aquarium Clear And Transparent. The Formula Is Gentle And Effective For Fish, Plants And Invertebrates, Promoting A Healthy Ecosystem In The Aquarium. Its Use Method Is Very Simple: When The Algae First Appear, Add 2 To 10l Of Water To The Filtration System, And After 3-5 Days Of Continuous Use, 1/5 Of The Water And Then Add, The First Small Amount Of Many Times. When The Algae Is Severe, The Appropriate Increase Is 2-3 Times. When The Algae Is Severe, It Can Be Recycled In Small Batches. After 2 Cycles, It Can Be Used Every 7-11 Days. For Small Fish, Be Careful To Reduce The Amount. After 3-5 Days Of Use, The Water Quality Will Be Clearly Clear And Bright, And The Filtration System Should Be Cleaned In Time. And By Using Powerful Aquarium Water Purification Tablets, You Can Create The Conditions To Promote The Growth Of Healthy Fish And Allow Them To Thrive In A Purified Environment.