The 20 gram Aqua One Algae Eliminator Blocks effectively controls many algae problems common to freshwater aquariums and ornamental fish ponds. The Aqua One Algae Eliminator Blocks kill growing algae and prevents algae from recurring. Suitable for cold water and tropical environments.

About This Algae Block

• 20g
• Slowly dissolves over 7-14 days
• Treats 20-120L
• Each square treats 20L

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