ok I went to feed one of my gold fish that in my new 15 gallon tank to my surprise he got s bit of fungus on hit mouth eeeeeeek so i didnt have really any medications but this mouth fungus stuff but the expirie date was for march 2004 so i thre it in Iam shure it hasent lost all it medical value by now has it? well is there anything I can do to stop the fungus groth ? all reply would be gratly welcomed...