Mako mermaids season 2 e1 info the seventh cycle

The seventh cycle when the seventh moon cycle zac has had and now he connecteion to mako island will deepen ondina goes into Rita's grotto and makes a potion that will strike zac with the power of 50 full moons but evie take off with cam in David's boat she dives and find the moon pool she enters the next day she is a mermaid