Originally Posted by TheDukeAnumber1
You're definitely being overly harsh/judgmental. I have seen his channel and he recommends treating sick fish with salt if you can before trying to use real meds. But in general he focuses on community planted aquariums and on offering products that are "easy" and would be more for novice hobbyists. So offering three meds that will cure most diseases, are plant safe, and can be safely used together... well I don't see why you would be so critical of that unless you're just not thinking of it from a novice standpoint.
I know- sigh- the truth is often harsh and sounds so mean. Sorry, no way around that. But, the good news is that we can all learn what we need to know with a bit of reading or a good, basic manual of fish health ( for novices). These resources will inform a new aquarist of the proper set-up of a quarantine tank, what to look for while fish are in quarantine, and when such things as deworming, antibacterials, or anti-biotics are in order.
For instance, one would learn that erythromycin is primarily for gram + bacteria and has, actually, very little effectiveness against gram - bacteria ( which is what we deal with 98% of time in the aquarium). So why recommend erythromycin when there are other drugs far more effective at dealing with the gram negative bacteria we do frequently face in the aquarium. Namely, columnaris. Erythromycin would be the last drug any educated aquarist would recommend for this condition. So, what is he recommending erythromycin for?
Most reputable resources on fish health will tell you to never
just indiscriminately medicate without knowing some information: source of fish, identification of symptoms, and/or the likelihood of pathogen to affect species.
Cory is telling the newcomer that none of these things matter- just medicate regardless of context.
It isn't true that this cocktail will cure "most diseases."
Also, it has been demonstrated that there are warnings of using metronidazole and erythromycin together.
I would find the med trio makes it "easier for the novice" debatable. It could just be the appearance of ease that the consumer is getting by a promise by a retailer that they will do all the thinking for them.