[Ntruder]

Here's something I never understood about these treatment processes listed...

Lets say you have some huge community with inverts and corals and a bunch of fish, and one of your fish comes down with ich or some other parasite. You obviously can't do any treatments in the main tank because of your corals and inverts. But what good is removing a single fish and treating him going to do? Won't he just go right back into the main tank and catch the parasite again? Even if you treat every single fish, they'd be going back into an infested main tank.

The only solution I see would be to quarantine every single fish at the same time, so that the parasite dies off in your main tank after 4 weeks or whatever. Otherwise you are just treating fish after fish then putting them back into the madness.

But clearly this is problematic. If you have lots of fish, you can't quarantine all of them in a small tank, that would cause too much stress. And even if you bought a full size quarantine tank (which nobody does) you wouldn't be able to keep the water quality safe because your biofilters won't work under treatments, and you won't have enough filtration to quarantine many fish at once. So the only remaining solution that I see is to get a separate quarantine tank for each fish and quarantine them all at the same time, and unless you happen to own a fish store, this seems a little unreasonable.

I must be missing something. Anybody know what it is? Do fish gain an immunity after you treat them or something? #5 mentions the word immunity, but then says that it just won't show symptoms.