Call and ask a public aquarium.
I volunteer at a public aquarium and a home tank is completely different. A public aquarium is very much like the sea as the fish are not stressed and have access to natural foods that are available all the time. The small tanks in public aquariums don't fare as well.
To me, and I have been doing this for quite a while, the best all around thing is to keep your fish in an immune condition. If your fish ever got infected with any of the common communicable diseases in this hobby, it's because you did not keep them immune either using the incorrect food, the wrong aquascape for health or you medicated or quarantined them forcing the fish to lose it's immunity.
There is a reason there are no old fully quarantined tanks or fish. None that I have found in decades. For a fish to live out it's normal lifespan which could be 10-20 years in many fish, they need a fully functioning immune system.
If your goal is just to keep fish a few years and watch them swim around seemingly healthy then quarantining and medicating whenever you see an ailment would work fine.
To me, a tank is not a success until all the animals are in a state of health where they are never affected by any disease just like in the sea and they only die of old age or jumping out, bullying, starving etc. All fish that can spawn are also spawning as all female fish in the sea are pregnant.
Just my senile opinion of course and you should keep your fish any way you feel is right for you and them.
