What are good show ideas about mermaids?

Ahhhh I love mermaids! I have a few ideas.

1. It could be about a mermaid who lives in the ocean and falls in love with a beach boy who owns a boat and spends a lot of time on the water. as a mermaid, she can come on land once a month for 24 hours. during this one day a month, her tail becomes legs and all that stuff. so when she met this boy, she was a human on land because it was during the day that she could be on land. but eventually they meet again and he realizes that she is a mermaid, and he's okay with but she tells him that he needs to keep it a secret. so basically the whole show would be about their relationship and how hard it is to keep it up.

2. it could be about a normal teenage girl (or a few) who somehow become mermaids when they touch water, and their daily struggle to keep the secret.

3. a girl who lives a double life, spending half her time as a mermaid in the ocean, and the other half of her time as a human on land. no one knows about her double life except for herself, so the show would be based around the struggle of keeping her double life under wraps.