I have had my three veil tail female bettas for months. Unsure how many, I lost count. xP
They seem pretty healthy. They swim around,eat, etc... but problems have been popping up for the last couple of months.
The first was with Zetta. Zetta is bi-colored, there is another word to describe her but I forgot. When I bought her from Petco she was white with purplish pink fins and "cheeks" if you will. The pink started to fade though as she grew. The color had left her tail clear and was starting to disappear on her dorsal and anal fin. The past week it started to come back. On the tail is two purple specks that just appeared. I have no idea how or why this is happening.
Then there's Ritz and Ruby, they are both red. Ritz clenches her tail together sometimes. It happens when she stops swimming, but it does not happen every time she pauses. Ruby only lightly clenches her tail not as much as Ritz.