Hello everyone, I am in a rather frantic panic, for my beloved tilapia are dying. The only symptoms I see from them is lethargy, loss of appetite, and physically their underbellies are sunk inward. I did an autopsy and when I cut into them, a green fluid came out. Each day about 5 or so fish will get sick and die later on in the night. I don't know what to do at this point. Not sure if anyone else has had a problem like this, with tilapia or any other fish. Some feedback would be appreciated tremendously. Thanks. -Elliot