So, sort of a second part to my quarantine thread I just posted I am curious if anyone ever doses their tanks with Paraguard, Melafix, or similar medications as a PREVENTATIVE. Are these drugs you should ONLY dose if you suspect a problem or can they even be used as preventative? I understand bacteria/parasite resistance to medications in mammals, not sure if it's the same for aquatic critters. Having recently gotten into OEBTs I am worried about bacterial infections since I know it can be a somewhat common issue with them. I have IAL and alder cones in the tank and will be doing 20% per week WCs but is that REALLY all you can do to try to prevent this sort of thing? Likewise with something like vorticella parasites and neos, could a preventative work? Thanks in advance!