I see what you are trying to do.. just want to break in the new skimmer. I see no problem with using your change water.. just dump it in the sump and let the skimmer work for a bit. Then when its time to bring your old tank into your new tank setup (which I am assuming this is) .. just dump the contents of that sump.. clean out the skimmer and then let'er rip with the system. You will just have to adjust it accordingly.. but your initial break in will get rid of any residuals on the skimmer/sump..
So, I say go for it :-) .. its just the effort of dumping the water in and then removing it later.
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Chad
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