In all the years that I have been keeping fish, I have never seen this before. First I had a Male Tiger Barb that was swimming around the tank erratically, spinning around in circles and darting everywhere. going nose up and just sitting like that for a few seconds and then darting around again and just acting like a fish that's dyeing. I took him out and euthanized him. Weeks later I now have a male Rosy Barb doing the same thing. Does Anyone know what it is?