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Without a refractometer, I'd say the safest thing would be to just keep everything the way it is until you receive it. I'm curious if anyone else here has any thoughts. If this was my tank, that's what I'd be doing.
Also... just an FYI - if you go the copper route, you'll want to pull that rock out of your QT that the tang is flashing against. Any calcium based things (sand, live rock, etc) will mess with your copper concentrations and make it tough to keep a stable amount of copper in suspension. Or so I've heard...
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