Dont know if this has been shared but just a heads up.. http://www.ncwildlife.org/News-Archives/update-to-consumer-alert-aquarium-moss-balls-may-contain-invasive-zebra-mussels. While no confirmed cases have been reported in North Carolina, the Wildlife Commission received notice that it appears the moss balls were imported from Ukraine to a distributor in California that recently shipped contaminated product to pet stores nationwide. The facility that imports the moss balls has been quarantined and all shipments of moss balls have been stopped, according to a news release from Montana Fish, Wildlife & Parks.