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I think it might be a swim bladder problem. It looks like she cannot keep afloat, she's having to swim upwards in small bursts. She floats down a little, then swims upwards a bit, then floats downwards again. My black tetra is quite old though; she's almost eight years old. Please help, and...

I bought three new baby zebra danios about a year ago to keep Hershey, also a zebra danio, happy because Hershey's partner died. Before, the babies were only a third the size of Hershey, so Hershey had to chase away the larger fish in order to keep the babies safe. Now, the babies are almost...