Quarantine ..... Do you or don't you?

[intarsiabox]

I don't and so far have never had a diseased fish in my tank. I suppose quarentining would be the smart thing to do. But IMO a lot of diseases are brought on by stress that decreases a fishes immune system to fight of diseases that and it could normally take care of naturally. I think the fish will be less stressed in a good sized established tank. So far my theory has worked for me.