I finally found a good diagnosis for the sick fish that fits his symptoms, though he has shown some improvement with the addition of salt, Melafix(anti bacterial), and Premafix(anti fungal). There is a parasite called Flukes which is easily treatable with a safe medication called Praziquel (PraziPond is the market name). PraziPond is a powder which is not easily disolved in water, but does dissolve in Proform-C or malachite green. It can be added as a preventative in Spring and Fall. I was not able to find this medication locally despite having 5 different pet stores and pond specialty shops nearby. I ordered mine through PondDoc.com.
Prazipond is not cheap, but it is much safer than alternatives which kill your beneficial bacteria or can overdose your fish. Fish ingesting the prazipond powder is even safe. One article I read indicated it will not harm your other pets who perhaps get a bit from drinking the water from the pond. It is a de-wormer often given to Dogs and Cats in pill form.
