Yikes! Glad you caught her before they all died though
Unfortunately, one of my bettas died recently, and another female died about a month ago. My remaining betta is now acting differently, as if he's depressed. He has a bubblenest with about a two inch diameter and even after water changes he rebuilds the whole thing overnight. He just sits under it all day except when I come over, and even then he sometimes doesn't come out. Does he need company? I care for him a lot and he's just a great fish, I hate to see him in distress.
Here is a pic of him:
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