The sera alder cones prevent fungal infections and spawn fungus in a natural way. Additionally, 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, which ideally recreates the natural living conditions and thus allows for appropriate care.Application sera Alder cones1 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.