Ocellaris Clown developing white edges on tail fin! HELP

[mkuhl70]

Hello, My clown started developing white edges on its tail fin 2 weeks ago. I cant tell if this is a disease or if clowns develop new patterns. I only have the clown and two turbo snails in a 30 gallon tank. All my parameters are where they need to be and I do weekly 15% water changes. Ive had this clown for just over a year now. See attached photos to see what it looks like! Any insight or advice is welcome, thanks!

 

[Big G]

Can't tell from the pictures, but disease like Fin Rot usually has a tattered uneven look.

 

[OrionN]

That is normal. The have a clear whiteish edge on the Caudal and Pectoralis fins.