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Putting the rock in will definitely give it a serious jump start on the bacteria, but it won't be up to full par. It depends what your bioload is. I had a couple corals, and a few fish and I transferred immediately from a 55 to a 125, but I also used the entire 55 gallons of water in the 125, in addition to the new water I made up for it.
As for the sand, you can take the top 1" of sand from the existing setup for the new one. Don't go any further than that 1" or so or you will get into the icky stuff that smells really bad and can crash your tank.
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125G AGA, dual overflows,40#LR,120#crushed coral, ETSS 800 skimmer, 6' light w/3 150W 14k MH, 72w actinic,Iwaki MD-100RLT. Acro,leather,monti cap,kenya tree,cauliflower,frogspawn,gorgonian
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