Larry,
Yes of course ich is a parasite.
I am not an expert as I have never treated it, the reason is I use a four week quarantine including hyposalinity. So I will keep my fingers crossed.
I have read of many people who get a flare-up of ich in their tank from time to time, usually related to an acute stress such as poor water quality, temperature fluctuation etc, which goes away with supportive treatment and maintaining good water conditions. Also a lot of people use garlic which is similar to how my grandmother would treat a cold by tying a sock around your neck ie. an excellent placebo.
Anyway there are a lot of opinions on this and we all have to make up our own minds I guess. For me, I will go with a rigid quarantine regimen rather than trying to treat my tank later.
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