Join Date: Oct 2010
Location: Victoria, Australia
Yep, sometimes in spite of the best care we give them, things just don't work out. I felt like the worst betta owner ever when three of mine died within about a fortnight of each other. Two deaths were accidental (choking, and jumping out) and the last betta went from being the picture of health to needing to be euthanised in about 12 hours.
That's also the trouble with divided tanks, and why I'm leery of them. It's all too easy for the adjacent fish to get sick if quarantine procedures aren't put in place as soon as you suspect one of the fish might not be well.
If you're doing correct water changes for the stocking level of your tank, and are feeding a well-balanced diet, then I don't really see that there is much more you can do.
There's something in my water that the Crowntails don't like. It's not particularly hard, but even when I add tannins to soften it, and do daily water changes, their tails still melt off. It's not something I can help, but it still makes me feel terrible.
So just keep your chin up. These things happen to everyone. And if you think it's something in the water, maybe look into an alternate source like bottled for now, while your other bettas are feeling under the weather.