All of my female bettas in my community tank died within 3 days. It's ONLY the females that were affected, and I noticed that as they were dying and after they died, they had discolored blotches on them. They either had red blotches with dents in their bodies or yellowish-gray blotches with risen scales over the affected area. What could this be? I never took any pictures, because I was focused on getting them out of my tank. I have one female who I did keep, my sweet Naussie. She has red blotches and dents on her head. My friend's CT female, Shadow, went from completely black to white with red blotches. What could this be?!