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Most sources I have seen quote 1.008-1.009. I have seen a site or two that said 1.010. I do not ever recall seeing higher. I do think that Ich can survive in higher, so if the idea is to kill that parasite, then i would drop it the extra just to be safe.
Todd I haven't either. I like for him to post the site where he got that information that 1.019 is acceptable for killing ich that is totally wrong information.
Yeah, I plan to leave them there for 4 weeks, then transfer to my display. The only problem is going to be tangs. There is no way to have a quarantine large enough for them, at least not at my house, but nothing else is going in without it. That Marine Velvet is bad news.