A blend of the 6 most widely used marine microalgae for use with invertebrates: Isochrysis, Pavlova, Tetraselmis, Chaetoceros calcitrans, Thalassiosira weissflogii and Thalassiosira pseudonana that has demonstrated success with a variety of shellfish and other invertebrates such as bivalves, brine shrimp, tube worms, & sea cucumber larvae.