Mermaid Problem

I have this problem too. I've described it and my solution in some of my mermaid videos. The thing I do is I use Master Controller to remove and then add the mermaid occult to them. This gives them the default scales - purple for female and blue for males. When they get out of the water and back in again they get their tails.

I've got the correct scale colours written down somewhere. I'll post them for you later if you want them.