Mako mermaids: an h2o adventure

Sirena the heart of the pod doesn't want to loose her sister aquata  but, due to the unfortunate show up of Zac in the moon pool leaves Veridia, the head of the mermaid council worried that Mako is not safe for us mermaids anymore.... Sirena, Lyla and Nixie go after Zac and try to take away his powers of a merman. Things don't go right as Zac's girlfriend, Evie cannot stand their suspiciousness. During school hours they use their powers and wet Zac, expecting that he will get exposed. Their plan doesn't work. But it wasn't just them who were the mermaids. Rita Santos, the principal of sun coast high, Spotted them. From then on they started staying with  her..... they were getting closer to Zac. Until he got hold of the trident. Now that he was the strongest of them all he could expose them. Now the secret lies between them all unless.... Zac takes advantage of it. Our the mermaids safe anymore??? If not who's going to help them??? Veridia???