The sera alder cones can help prevent fungal infections and fungus in a natural way. In addition, they support natural behavior and readiness to spawn, and they lower the pH value of the water. Alder cones are suitable for preparing "black water" by releasing tannins into the water, which helps recreate the natural living conditions of most fish and thus allows for appropriate care.
1 cone per each 10 l (2.6 US gal.) of aquarium water can be added. Dosage can be up to 1 cone per 1 l (1 US quart) for supporting disease treatments. However, the pH value needs to be monitored when doing so.