I got a female betta from petsmart about 6 months ago. She was like a tan grey and labeled a half moon. People said she had been there for a long time and that she was too ugly to sell. I was buying for a sorority and I decided that even if i didn't like her, she could live in a happy environment, recently her tail seems to not be half moon. Also she turned completely purple so definitely marble gene. Just wondering if her tail is normal, and If i should worry about it, thanks. please see attached files for images.