My 10 gallon tank has been ravaged by something. Since May, I have lost both of my guppies and three of my four albino cories. The parameters are mostly at their normal levels, although the pH was slightly higher than usual. The thing is, my cories have displayed many of the symptoms of fish tuberculosis that I have read about. They hid in the corner and got really pale, one lay on its side with a sunken belly, lots of bad things. Is this fish tuberculosis? What in the world should I do with my poor remaining cory? If it is TB, I'm assuming he's infected. I'm trying to start up a 55 gallon, but I don't want to add infected fish.