HI all, wondering if anyone is familiar with what might be going on here. I have a female betta , part of a sorority in a 20 gallon tank with 5 other girls. She has always been light , koi colored , but the past few weeks I have noticed her slowly losing the reddish/orange color on her head, and one area on her fin. It doesn’t look fuzzy or patchy, there’s no bumps, and it’s not rusty colored like velvet. She’s just turning whiter and whiter?! I read about neon tetra disease but it doesn’t really seem to be this either as she is acting competely normal. One of my dark females had something similar a few months ago but it wasn’t on her face, it was mostly her body that turned lighter in bands. Could this be her version of breeding stripes? Pics attached - from today and a few months ago.