Dennerle Black Cones – Alder Cones for Water Treatment

Dennerle Black Cones – Natural Water Care for Your Aquarium

Dennerle Black Cones are high-quality natural alder cones specially developed for water treatment in freshwater aquariums. They continuously release tannins and humic acids that naturally acidify the water and create ideal conditions for blackwater biotopes.

• Natural water treatment: The Black Cones release valuable tannins and humic acids that gently acidify the water and create a natural environment for sensitive fish species.
• Promotes well-being and breeding: Many ornamental fish, especially from South American and Asian blackwater areas, thrive in soft, slightly acidic water with natural humic substances – ideal conditions for breeding.
• Easy application and long-lasting effect: Simply place one or more cones into the aquarium. They release their active ingredients in a controlled manner over several weeks and are easy to dose.
• 100% natural product: The alder cones are hand-picked and untreated – no artificial additives or chemicals.

What sets Dennerle Black Cones apart

Unlike chemical water conditioners, Dennerle Black Cones offer a natural and gentle method to lower pH and improve water quality. They are free from synthetic additives and therefore particularly suitable for sensitive aquarium inhabitants such as shrimp and invertebrates. The long-lasting, uniform release of active ingredients makes them a reliable choice for ongoing water care.

Ideal for...

Dennerle Black Cones are ideal for aquariums with soft water fish such as neon tetras, dwarf cichlids, discus fish, and Asian barbs. They are also very popular in shrimp and invertebrate aquariums, as the tannins they contain have an antibacterial effect and promote animal health. For aquascapers, they offer a natural way to simulate blackwater conditions.

How to use Dennerle Black Cones

1. Briefly rinse the cones with clean water before first use to remove any dust residues.
2. Place 1–3 cones directly into the water or into the filter depending on aquarium size.
3. Leave the cones in the aquarium until they have lost their effect (usually 2–4 weeks, depending on quantity and desired effect).
4. Replace the cones as needed with fresh ones to maintain consistent water parameters.