Block Algae Eliminator 4pk 20g X 4

DescriptionAqua One Algae Block 20g x4 (95010) Aqua One Algae Blocks provides a slow release to assist in the control of algae within your aquarium. Specifications: Available in 3 sizes 95001 – Algae Block 20g95010 – Algae Block 4 pack 20g x495008 – Alge Block 20g 50/bagSuitable For: Coldwater & Freshwater Tropical