Tropical Science Labs ATCMCL520 Marine Clean, 16-Ounce Tropical Science Labs Marine Clean Increases oxygen availability while cutting down on time consuming maintenance and reducing wear and tear on expensive filtration systems Marine-Clean is a very high-density blend of non-pathogenic, heterotrophs that keep the aquatic system clea Tropical Science Labs Marine Clean Increases oxygen availability while cutting down on time consuming maintenance and reducing wear and tear on expensive filtration systems Marine-Clean is a very high-density blend of non-pathogenic, heterotrophs that keep the aquatic system clear