What type of copper do you two plan to use?
A few people on another forum got me second guessing whether the Hanna kit was meant for saltwater use. I dug around and couldn't find it stating it was and stopped using it after a failed QT. Looking for that thread I found a bunch of people seem to be using it now with success, so that's good to know! With something as sensitive as Copper it's nice not to rely on color change type tests. I had success with it battling velvet in my 100g, paired with Copper Power. Wrasse and other copper sensitive fish made it through. It looks like their recommended dose is overkill according to humblefish on R2R, so if you plan to go that route adjust for it. I never had a problem with O.D. but I also raised my levels over 5 or so days if I didn't see signs of velvet.
What fish do you both have in QT now? Pics
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[MENTION=1]EyeReef[/MENTION] If I don't notice signs of ich or velvet I like to start with prazipro. I've lost a few fish with no real symptoms and I always wonder if it was parasitic so I like to rule that out early. Getting 2 weeks into a copper treatment and wondering if that flashing is flukes or ich sucks.