Originally Posted by 1journeyman
Ich has a life cycle of around 4 weeks. Now, there are reported cases of it occasionally going into some sort of cyst and lasting longer.
The point is, if you QT your fish and they show no signs of ich then you can add them to your display with no fear of adding ich.
This all is IF you practice proper QT procedures. If you do not then sure you could accidentally add ich to your display and until you remove all of the fish and allow the display to be fallow for 4-6 weeks you're always going to have ich in your tank.
Not trying to argue with you, but I want the original poster and other readers of this thread to understand ich. It is a completely avoidable scourge.
Again, I 100% agree. It is also true that the scientist don't agree. If you look at the facts, it makes perfect sense though. Ich, as a parasite, must be introduced into the system. If you want to go one step further you can Hypo all fish comming in and QT all other inhabitants for 6-8 weeks. I know plenty of people with succesfull systems and no ich whatsoever. And you said
Almost every tank has Some sort of ICH in the system all of the time.
I am not trying to argue with you either, but aquarists should not think that ich is always there and there is nothing to be done about it.