We just had a black, female Balloon Molly pass away from not being able to treat her fungal infection quickly enough. Until we first noticed it, she was in her normal tank then removed to be by herself to be treated. We treated both the 55 gallon she was originally in, to be safe, and the tank that we separated her to. However, after her passing away, we noticed that an older, male Balloon Molly now has a small bump (possibly fungus or ich, not sure if either or just some sort of scar) on his side, about the same location her fungal infection affected her. In the 48 hour period that we had her, she swam around with every fish in the tank at some point, mostly the other Balloon Mollies of course, so we're thinking maybe she had a fungus that affected only her kind? He's the only one that we can see that is noticeably affected, not even the Bumblebee Gobies we've got aren't affected by it. Is our theory correct?