Treatmeant for diseases such as, fwd, med, or any other is only a last resort when the animal can't combat the diseases by itself. Any treatment will cause a very big strees on the animal. Its only done when it have to be done. When I first started this hobby, only 20% of my fish that went through treatment survie, now its up to 50%. The best way, is to prevent the animals from getting sick. IMO, it is easier to prevent than to treat an animal from disease.