Originally Posted by neilanh
The water doesnt cycle, the bacteria don't live in the water column. If you're transferring everything over to the new tank, your substrate, rocks, filter, etc have all the bacteria. If you do a complete transfer, keeping everything wet in the process, you'll be fine.
I totally agree. As long as you dont lose the bacteria from your filters and rocks you`ll be good to go. My only suggestion is that you use new sand or really do a extra special cleaning of the sand that you have because there will some foul stuff in there. When I changed over I used new sand and seeded it with a cup or two of sand from my tank.