I just did this but I had more new rock than old rock so what I did was let the new tank cycle with all the new rock. I did 5g/day swaps between the two tanks as well to bring them closer together as far as params go (measured or not but main 3 params already matched). Then I simply drained whatever my small tank held on the day of transfer and brought over the old rock/corals along with that same volume from the original tank. Most of my corals didn't even slime.
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