Question: why are nixie and lyla not in season 2?
Answer: Episodes. Lyla and Nixie have left Sirena to join in a search for a new home. Out at sea, Sirena is unable to convince the mermaid council that Zac is not a threat to them. ... Evie, fearing the mermaids may harm Zac, comes to his rescue, only to be transformed into a mermaid!