As mentioned under suitability in the PROPERTIES section of the product page, this product is listed as being suitable for use in the culture of cyanobacteria. In addition, there are two other products that are specifically formulated for the culture of these organisms. To review each option please see the links below.
C3061, Cyano BG-11 Medium
https://www.sigmaaldrich.com/product/sigma/c3061
73818, BG11 Broth
https://www.sigmaaldrich.com/product/sial/73816