sera alder cones (50 pcs.)- – Natural pH Reducer & Blackwater Conditioner

Sera Alder Cones are a natural way to lower pH and create blackwater conditions ideal for many tropical fish species. They release beneficial tannins that help prevent fungal infections, support healthy spawning behavior, and promote species-appropriate environments. Perfect for soft-water and Amazon biotope aquariums, these cones also aid in the supportive treatment of fish diseases.
Easy to use—simply add 1 cone per 10 L of aquarium water. Safe, effective, and 100% natural.