I would suggest that you just switch everything over to the bigger tank. When I switched over to my 125 gallon from my 55 gallon I just added about 3/4 of my water from my 55 gallon and then added new water till it was full. Take all the LR
and switch it over since it is already cured and supplement new LR
that is cured at the LFS
. I would not switch over the sand as it is really foul once you get past the surface of it. Add new sand and seed it with a cup or two of the old sand. Then bring over the corals and fish. I did mine in half a day.