I introduced a festivum from a LFS (probably Asian raised) into my tank with a beautiful chocolate cichlid. The festivum passed on after a few days displaying no sign of sickness except for some dark colors. Now my chocolate is acting strange, loss of appetite, dark colors and long strings of feces. Help I need a cure. This happened to me a few years ago after adding angel fish in with my chocolate and was nerer able to get him to recover. what is the disease and what is the cure.