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Ari5736, new fish do not necessarily develop ich even if ich is in the tank. Ich has been in my reef for three decades and I have no problem adding new fish unless the new fish is already infected. I added two fish today. Of course this is not 100% true of all tanks. It depends on the conditiion of the new fish, the stress level in the tank, the amount of infection in the tank, the temperature and a variety of other things.
It is vastly better if there is no ich in our tanks in the first place. A stressed fish added to a tank with ich stands a very good chance to get the disease in which case you may have to remove the fish to cure. After it is cured, it "may" have a better chance to avoid the disease when it is added to your tank. I am in no way advising you to add a fish to a tank with ich, just giving my opinion on what may happen.
Unfortunately, many tanks, for one reason or another are infected with ich. The reason for this thread was to try to find out why some tanks crash from ich with massive die offs and in some tanks it is not a problem.
Have a great day.
Paul |