Looks like I am going to pull the trigger on a 105gal Deep sea aquatics rimless tank. I just have a few questions. I have a 30,29 cube, and 55 gal tanks. I would like to combine all the rocks I have into one. All the tanks are established. They all use the same water and are pretty much the same. What is the best way to do it? Also should I get new sand for the tank or can I use the old sand from the tanks? Just want to make sure I do it right the first time. Thanks in advance