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I would just make one change to your plan......Add the amount of new water to tank that you want,...say 50% ...then top off with the old, since you never know the exact amount you will need to top off after all rock and sand is in....So this the planadd new water to
Set new tank up
Put new sand in. A cup or 2 of old sand
Put as much old water add new water as needed. Put old liverock in(after washing) put corals and fish...and I'm done! And all is bueno.
Good advice here. I don't add old tank water at all when I change systems. But you can add old tank water, but keep it at less than 50% of your total water volume.I would just make one change to your plan......Add the amount of new water to tank that you want,...say 50% ...then top off with the old, since you never know the exact amount you will need to top off after all rock and sand is in....

