Hi, I'm not sure what's going on with my Royal Gramma. The tip of her pelvic fin is white. I can't tell if it's damaged from the rocks or if it's some type of fungus. It doesn't look fuzzy and it's not spreading. It hasn't changed for about four days. It almost looks like the colored outer part of the fin was removed and there's some cartilage left behind or something. Is that possible? I don't know the fin's anatomy. She is eating fine and active. Thanks!