MrTuskfish, I think what he is saying (and I think we discussed this before) is that you can have ich in a tank as my tank probably does. And not notice it, ever. When I say ever I mean at least 35 years as that is about how long it has been since I saw ich or any other paracite. There must be ich in my tank because I have not quarantined in that long and I add NSW along with creatures from the sea many times during the year. I also collect mud for the bacteria. I don't battle ich as it does not bother my fish some of which are 19 years old and still spawning. As a matter of fact all of my fish except a copperband and two gobies without mates are spawning including mandarins, clown gobies, blue stripe pipefish and cardinals. So is ich affecting my tank? Maybe, but for some reason it is not harming anything any more than ich in the sea harms anything. What it does, is keep their immune system in shape (like it does in the sea) so ich does not bother it. We as humans get shots of weakened viruses to help keep our immune system protect us. Of course there is more to it than that and I posted that numerous times, but ich does not always kill the tank as my tank can prove.
35 years with no ich symptoms seems long enough of a test to prove my theory but I hope to let the tank for another 8 years when it will be fifty. :dance:
But if you don't have my tank or my ideas, then you better quarantine.
References,
Me