Halophiles are categorized by the levels of salt at which they grow best. Halophiles can either be categorized as slight halophiles, moderate halophiles, or extreme halophiles. Slight halophiles grow best in concentrations of salt around 2% to 5%. An example of a slight halophile is "Erythrobacter flavus". Slight halophiles live in mud on the ocean floor, in seawater, and in garden soil.