State wildlife officials are urging Indiana residents to destroy invasive zebra mussels that could be hiding in so-called moss balls sold for aquariums. The Indiana Department of Natural Resources says aquarium owners should destroy any Marimo moss balls they have purchased this year from any aquarium or pet supply store because they might contain the mollusks. They have the potential to harm Indiana’s aquatic environment. The DNR says the moss balls should be disposed of in a sealed container in the trash to prevent them from entering local waterways. They should not be discarded in drains, waterways or gardens.