AlgaeFix 16 Oz. & EcoFix 8 oz. AlgaeFix is a liquid algae-control product for use in aquariums containing live plants and fish. AlgaeFix controls many types of algae including "green water" blooms and filamentous algae that cover the glass, ornaments, plants, and gravel. AlgaeFix is registered by the United States Environmental Protection Agency for use in aquariums containing live aquatic plants and fish. NOT SAFE FOR SNAILS. EcoFix- Makes pond water clean and clear. Breaks down dead algae. Increases the concentration of dissolved oxygen in pond water. Helps create a healthy ecosystem for pond fish. Can be used in ponds containing salt.