Of course no hard feelings. I wasn't arguing that natural things weren't any less potent, because they are just as potent, but I'm speaking from personal expirience on this one as well as what I know others do. There are some things that are extremely hard to use in quantities that would cause harm to the fish, Melafix is one of them. Another is Metro as I have already stated, you can dose that 20 times over the reccomended dose and most likely still not have any health problems with the fish your using it on. The dosing instructions on most aquarium meds are just reccomendations, they're not set in stone, its just a base line where the meds become effective on what they treat for. Another example is salt, if you read the dosing reccomendations for salt, most of the time it will tell you to only use a few tablespoons of salt per 10gal of water. However, I know again from expirience and was told to do this by others who have a lot more knowledge about meds than I do, that when treating for bacteria, ich, or a fungal infection that 1/2 to 3/4 of a cup of salt per 10gal is the best way to go. I've done it and it doesn't bother the fish at all, even cories and farlowella species.
As I said above, I would not be reccomending a dosage level that would be unsafe for the fish. If I didn't know about the medication being used I wouldn't be suggesting how to use it.