Well im going to be taking my 30 gallon tank and replacing it with a 40 breeder with a 20 gallon sump/refugium. I dont have a sump on my 30 so it will be a 30 gallon upgrade total. My question is can I just add the sand + new sand to the tank, dump in old water plus new water, and put the corals and liverock in? Essentially a 50% water change? I will be using sand and live rock from my 10 gallon in the refugium... so I shouldnt have too much of a cycle. The only thing new i will be adding is 30 gallons of salt water and 20-40ish pounds of new sand. Thanks.