Today I went to check all my bettas and he was died. Before I went to school he was acting odd and barely moving. He also had been swimming oddly, but and had recently started again.:-( My black phantom tetras also died from what I don'y know. I'm thinking hard water because they just got done working on the water lines in my neirborhood and had a boil water for a moment, but said it's okay to use again. So I did my water changes and five of my fish died. I still have my others.