Fritz Maracyn 20 Count Cichlid Onyx Sand™ is most effective

Onyx Sand™ is most effective when used alone as an integral substrate bed

Each filter comes preloaded with filter sponges

After rinsing

Iron Oxide

Fritz Maracyn 20 Count Cichlid Onyx Sand™ is most effectiveHighly effective treatment for bacterial infections in fish Effective against gram positive pathogenic organisms: Symptoms of clamped fins, swollen eyes, heavy or rapid breathing, patchy coloration, change in swimming behavior About Mardel Maracyn Provides relief from bacterial infections such as body fungus, gill disease and popeye in fresh and saltwater aquariums. Mardel Maracyn is a specially compounded broad spectrum antibiotic (erythromycin)