The Water Nymphs live in the Black-Mud Swamp. They are like tiny little mermaids and live in underwater bubbles made of a material that they produce from the leaves of the Xylith plant which grows only on the back of a giant turtle that was in a deep sleep because of a red willow tree that emitted a hypnotic gas growing on its shell.
Queen Algae is the queen of the Water Nymphs.
Lusiz is one of the Water Nymphs. She once went to pick Xylith leaves but fell into a deep sleep because of the red willow. The Winx defeated the tree and saved Lusiz.