Discus Leopard with FishTB, HLLS&Flukes is swimming head down or tumbling, or head standing Discus
This YouTube video (by Gerald Bassleer, uploaded Jan 22, 2016) documents a discus (Leopard) showing abnormal swimming behavior. The speaker narrates observations over time—"half year ago" it was different, "now it's normal," and the fish later goes "head down" (tumbling/head-standing behavior).
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