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I believed that my betta fish had swim bladder disease and two days later, it died. But when it died his gills were spread wide open. does that mean anything?

When I saw my betta fish lying on the bottom of the bowl, I thought it was just resting and just enjoyed being down there. But one day he started to swim around on his side and seemed like he couldn't control the way he swam. I was worried and searched online and found a result of either...