I began by setting up my new aquaclear and all of the new gravel in the tank, along with 40 gallons of new treated water and water frommy 10 gallon tank. I then added more water to my 10 so the fish didn't have to live in half a tank. After 4 days or so, I rinsed a mesh laundry bag (that had never been out of the package) and filled it with half of the old rocks I had in my 10 gallon tank. About one week into it, I took out 5 gallons and added 5 more from the 10g. tank, just like I would do for a normal water change. I did this for another week, and each day, I would add one ornament from the 10g to the 45g. I did another water change at the end of the second week, as I did the week prior, then let is sit without being touch for a whole week. At the end of the third week, I took 10 gallons out of the 45g tank, then added my fish (after testing the water with a test kit, no ammonia, and really low nitrate/nitrites). I then added the rest of the water and called it a day.