Promotes Health For All Fresh & Saltwater Fish San Francisco Bay Brand Frozen Spirulina Brine Shrimp have been gut-loaded with Spirulina algae (used as an immune system booster in commercial aquaculture operations for years) in holding tanks prior to freezing. We recommend feeding this product to your fish a couple of days prior to undergoing a stressful situation such as a big water exchange, transfer to a new aquarium, reconfiguring of plants, adding of other fish etc. to help boost their immune system. Product Features All natural Frozen fresh Bio-enriched Promotes health Great stimulant for triggering the feeding instinct of fish Promotes proper growth and supports color Recommended For Saltwater: Tangs, Rabbitfish, Clownfish, Angels, Chromis and others. Freshwater: Sharks, African Cichlids, American Cichlids, Platies, Swordtails, Mollies, Silver Dollars and others.