Cephalexin is a Cephalosporin Antibiotic. Used for the treatment of non-specific bacterial infection against micro-organisms during the stage of active multiplication. For fish in fresh water or marine aquariums. DOSAGE & ADMINISTRATION: Use one capsule per 10 gallons of water in aquarium to be treated. A partial water change should be made between each treatment. One capsule every day, for ten days. Each Cephalexin capsule will dissolve rapidly and circulate through the water. IMPORTANT: Treat for full recommended dosage. Cephalexin when used, will not affect biological filter beds.