Just a point Doug. When we were there the CBB's did not exhibit any signs of what we will now euphemistically call "WAI Syndrome", so maybe that tells us something. As to freshwater dip. That is not something I often do, but remember that he does not use copper, so it would seem to be in order. When I brought my Lemonpeel home I gave him a 15 minute dip. He is certainly none the worse for wear.
There is something else that is also effective. As you plan to quarantine, you could go the hyposalinity route in the quarantine tank. Then a week or so before you move the fish to the main tank, you would increase the salinity in the quarantine tank.
BTW it is Wednesday when he does not open until 2:00 pm