Alder cones, used in the aquarium and terrarium industry, are valued for their beneficial properties. They help acidify the water and release tannins, promoting a healthy environment for many fish and invertebrates. Alder cones are also a food source for certain organisms, such as snails and shrimp.
 Adding alder cones to terrariums can serve as a hiding place and a surface for beneficial microorganisms to colonize. Their natural appearance also adds an aesthetic touch to the decor. They are often used in biotope aquariums, replicating natural habitats.