Dr. Tank BGA Zero Tablets work to reduce blue-green algae, also known as cyanobacteria. This unwanted growth is characterized by extensive, highly visible blooms that can appear as toxic blue-green mats in your aquarium. Key Features and Important Notes It can clean filamentous algae, brown algae, blue algae, and black beard algae. The information above serves as a guideline - Dosing and more in-depth instructions can be found on the bottle. This product is not a cure for BGA on its own; follow good aquarium maintenance practices to achieve the best results. Safety Notice: Remove bryophytes and shrimps before treatment! Product Specifications Includes 30 tabs per bottle. Dosing: Apply to freshwater. Place the tablets directly onto the affected area according to the dosing instructions included on the bottle. The BGA will begin to separate and decompose within 72 hours. 3gal - 5 tabs 6gal - 10 tabs 10gal - 20 tabs 12gal - 25 tabs 17 gal - 30 tabs 25 gal - 50 tabs