Dennerle Black Cones x 50
Dennerle Black Cones are Alder cones which come from black Alder trees (alnus glutinosa). These release useful humic and tanning substances which help and protect fish and shrimps. They are 100% natural, and they are used for both water care and aquarium decoration. Contains 50 alder cones, sufficient for conditioning 1200 litres of aquarium water.