Sea Lettuce Ulva is a thin and flat green-colored algae that is best for keeping in the aquarium to feed herbivores and copepods. Sea Lettuce Ulva can tolerate a high circular flow without getting tumbled down and can tolerate ample exposure to low and very high light levels. This Sea Lettuce Ulva is a favorite appetite stimulant for most of the herbivorous animals. Sea Lettuce Ulva prefers to live in nutrient-rich water.