I'm pretty sure you can. You can't really QT a mandarin since it will have no pods to feed off of and eels don't take to treatments well. I'd leave them in and QT all your other fish.
I think they may be safe from ick, but may be carriers. I think you have to remove all of the fish to be completely sure that the ick is gone from the tank.
I have never quaratined my mandarins either-- they need pods to feed on. It never infected any other of my fish nor caught ich. I think the thick slim coat make it immune to ich.
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