Mix up your water,and go for it. Transfer as much of your old tank water as you can. Don't take this wrong,but don't make more out of it than what it is. This is what John at FAOIS said to me when I up graded to my 225. ,and he was right. Don't get me wrong it's going to be a little work,but after your done ,your going to say that was a piece of cake. Ted