[turbomkt]

Well, you can start by running the filter for the new tank on the old tank a bit. After that, you can do a few other things to help. Put some new gravel in bag of some sort (pantyhose seems to work well) and have that in the old tank for a while. Then, when you start the new tank up, you can put that in the new tank and even some gravel from the old tank the same way (If you want to return it to the old tank).