What is the meaning of a purple mermaids tail?

Its would be normal for your tail to change color if you're a mood mermaid. Blue is sad. Purple is Love. Yellow is happy. Green is joy and red is mad. But if you're not a mood mermaid and your tail changes color, then you're probably sick or you're probably going to gain a new power.

great cause i am a mermaid the kind when u can walk and then turn into one.