naturally seawater contains lot of nutrients, however I want to formulate my own commercial medium for my own marine microalgae isolate to grow in open pond/photobioreactors (Nannochloropsis sp), so what are the sole chemical sources are required ? such as Nitrogen, Phosphate etc. Is it necessary to add micronutrients in the medium composition? such as Fe, Zn, Cu, Co, Mo and Mn ?