Question: why do nixie and lyla leave?
Answer: She and Nixie are with the pod in season 2. Ivy Latimer as Nixie (series 1), one of the three mermaids. She is an adventurous girl, who often gets into trouble and only does what she believes is right. In series 2, it is explained that she and Lyla have left to search for a new home for the mermaid pod.