My fish are coming to the top of the water for air and their mouths are moving really fast like they are gasping and I don't know why!! All my water tests are fine, I even took a sample into the LFS to make sure and their test was perfect also. My water is cloudy and I don't know what to do! They were fine 2 days ago, now I have lost 2 neon tetras and don't have any idea that is going on. I did a gravel vac and %50 change yesterday and another %50 today. I have a guarami that has a chunk missing out of his back like he was in a fight or something also.