Many fish can develope what is refered to as
"aquired immunity" to
C.irritans. Typically after having battled it before. It is much less likely to happen with newer additions though. The one main thing to keep in mind while attempting something as risky as that, for every fish that does stave of the parasite many more will not. The chances of all fish aquiring immunity are slim.
The
"immunity" is also usually short lived (6ish
mo.) and the parasite is not eliminated from the tank either but rather lives in a balanced co-existance with the fish. Any thing that would typically upset that balance, (stress, new additions etc..) would spur on a new infestation.
UV's and
03 machines can only affect free floating parasites and not very effectively at that. Remember, it only takes one to create 1000's
IME, it's best to be rid of it completely. Quarantine, treat and fallow the main.
Cheers
Steve
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