Rhodomonas lens or salina. It is a high
DHA microalgae (one component of PhycoPure) and is motile (a swimmer). It is traditionally used to raise more fastidious species. Definitely good for pelagic copepods such as Acartia tonsa. My experience is that it likes cooler temperatures doing best at 18-22/23C. Under the scope it is irridescent red..cool stuff. I do not think it is the easiest to grow but it is cool having red cultures.