Personally, I would never medicate a tank chronically "just in case". Breeders do that to decrease the mortality in overcrowded conditions, but that ends up selecting for resistant bacteria & bugs & we the buyers end up with the problems <sickly fish, diseases that are resistant to treatment.> An example would be salt resistant ich in goldfish because breeders kept their stock in 0.3% salt to "prevent" ich.
So, no .... good clean water is the best IMO
. If you want to give the fish vitamins, do it naturally & give them some fresh food <veggies, worms & bugs & the like, depending on your fish.>