If your comet goldfish dies for no apparent reason but for dark patches under the intact scales, it might be viral hemorrhagic septicemia (VHS). There is no listed Rife frequencies for VHS but,
Hemorrhagic Fevers, Viral 193-50 Hz
Hemorrhagic Fevers, Viral 356-72 Hz
Hemorrhagic Fevers, Viral 426-16 Hz
Hemorrhagic Fevers, Viral 567-70 Hz
there is a set of frequencies for Viral Hemorrhagic Fevers.
Here is a set of gingivitis frequencies for fin rot.
There is a general set of frequencies for fungus, mold and yeast, that can be used for cloudy water. Together with a slice of garlic, the water clears up very quickly. But the cloudiness returns soon after the speakers are switched off. The spores have to be killed or suppressed using chemicals.
Have a nice day.