Thanks Lee for the info. But care to explain how to medicate the fish not necessary for guppy.

Whats the difference between Epsom salt with say the normal aquarium salt/rock salt?

I've heard of Metronidazole but how do you administer the medication to the fish. Just by dilution into the tank water or orally by crushing and mixing with the food for them to consume??

This would be an interesting topic for guppy fans. However we need someone to experiment on their guppies. I'm afraid of the acute dosage which would spell the end of your guppy