Re: all mermaid in my game not transforming

@FiretheSky Okay. So the issue is, I'm not able to replicate this in my game.  I have not added any CC that alters skin, clothing or body.

This is Ariel, a young adult and her teen brother Amal. I created them just for testing and please excuse my blatantly unoriginal female mermaid name. 🙂

This is Ariel's motives panel.  Can you confirm that your mermaid has the fishy mermaid icon and the Hydration need (not Hygiene)?

If your mermaid sim has these things, the only way to be sure there's a bug with the mermaid form is by moving the mods folder out, deleting the localthumbcache.package file and then testing a new save.  That cache file may carry effects from mods/cc to the new save, so that's why it's important to remove that, even when you turn off the mods/cc options in-game.