In regards to this, my concern is why do I care? Since my tank has seen 8 dots of ich in as many months, isn't your suggestion a lotof work for not a lot of return? I know, the level of return is relative, but really, I wouldn't empty my tank of fish for 6 weeks while soaking them in fresh water. That would be more stress than they could ever experience in the main tank. JMO.

I guess you dont care ... if you have seen 8 dots then maybe it is not problematic in your eyes ...hyposalinity is no more stressfull on fish than having a parasite attached to it ... this discussion is not whether you care if your Tang has 8 dots of ich every now and then ... it was the blanket statement that every tank with fish in it has ich which is not true

What lengths we will go through to get rid of it ( or not ) is up to the individual

Steve, I believe the "Blanket" statement was most of not all tanks have ich and I still believe that to be correct.

Doug