Hi All, I'm pretty new to owning a fish tank I have a 200L tank. I have had it for 3 months and I brought 2 Mollie's a month ago my black and silver molly has been swimming vertically at times. I have read that it could be a bladder disease but I'm not to sure. Can someone please help me. Here are some pics one of my tank and others of the molly thank you in advance
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