Should be a pretty easy as a swap goes two things pop out at me tho. Make sure while the transfer your fish and corals are in a bucket with a heater so the temp doesn't change to drastically. I've made that mistake before and lost some fish because I didn't see it taking so long. Always give yourself plenty of time so you don't rush and if any thing pops up you can deal with that. And second thing is try to not disrupt sand to much. I siphoned all the water out then gently scooped up the sand the put it right into the new tank then put a Tupperware dish down and poured the water into that. Also plan on haveing at least 50% new water made up in advance. Also afterward check water chem often cause you will go thru a micro cycle.