Teenager Zac decides to camp on Mako Island, unaware that three mermaids, Sirena, Nixie and Lyla, who are guardians of the island, are watching him. That night, when the full moon rises, the boy comes into contact with the magic water of the Moon Pool. The following morning, he wakes up discovering he has become a merman with a fish-like tail and the ability to control and manipulate water. His new-found merman abilities will cause problems for the mermaids.
I exactly don’t know about what top you are talking about, maybe it is from 16 episode?
If, yes, I find some similar tops, you can:
If it isn’t that top, give me a picture and I will try to find)