you are a braver man than I exposing a fish as expensive as a labouti to copper. I lost a perfectly healthy rhomboid wrasse to copper (following instructions to a a T) and that was the last time that stuff had any place in my fish care and quarantine routine. If you're going to get another tank anyway, look in to the tank transfer method.
Also, keeping a fish immersed in a toxic, potent, metabolic poison for weeks longer than recommended by any instruction anywhere is a terrible idea. If you're going to use copper, use it only for the amount of time the instructions for that product recommend with careful twice daily testing. I'm sure there are plenty of people who've done it and gotten away with it, but I'm sure there are plenty of people who've fallen asleep smoking without burning their houses down too. It doesn't make it a good idea.
My advice would be to put the labouti and the fire fish in the display and wait and see. I'd want to know for sure that it's ich before going to the lengths and extremes you'll have to to rid that tank of the parasite. The cure for ich is worse than ich as many times as it isn't. If your display tank has ich in it, you may very well never have any real problem. Your wrasse and fire fish may very well tolerate it fine, and you may very well go months, weeks, or years without seeing so much as a blemish. A knee jerk reaction now based on one or two spots that *might* be ich is far more likely to kill your fish.
If it does turn out to be ich, and it becomes a big enough problem to warrant intervening, you then only have to deal with one QT tank (though I still recommend tank transfer, or really anything other than copper) and you can treat all your fish at once.
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