Microalgae are not the economic value species, which can be directly exploited for human life. However, without the.m, there will be no source of primary organic foods. and thus, all fishery resources can not be existing. Most species of algae are beneficial because they provide food, and significant amount of oxygen. High nutrient concentrations in waters will cause eutrophication, and in the consequence, lead to reduction of water quality, environmental pollution and biodiversity dicline. In this study, the authors focused on determining the appropriated concentration of NH4 and PO4 for Platymonas sp. and Nannochloropsis oculata species in order to produce high biomass towards applying in practical production.