Dupla Hobby Alder Cones are natural botanical additions designed to enhance freshwater aquariums, particularly shrimp tanks and blackwater biotopes. Rich in tannins and humic substances, these alder cones help create a more natural environment by gently lowering pH and softening water conditions. As they slowly release beneficial compounds, they promote improved water quality, support fish immunity and provide biofilm growth that shrimp and fry can graze on. Ideal for breeding setups and biotope-style aquascapes, Dupla Hobby Alder Cones add both functional water-conditioning benefits and a natural forest-floor aesthetic to freshwater aquariums.