Glad to hear it!
When I did mine, I bought new sand and I vacuumed up the top of my old live sand. Got rid of all the crap (literately
. I had 60 pounds and vacuumed about 10 pound out of the old tank. I than used the remaining 50 pounds in my new tank without rinsing. I put it on top of the new sand (Which was not live), and now I got a 2 to 3in sand bed that for the most part is live. No issue's with gases or nitrates.
My transfer took me a good 4 hours as well. It was so worth moving from a 29 gallon to a 55 gallon. I also found some new tank mates along the way (Bristle Worms), I threw one HUGE one down the toilet. The darn thing was massive!! hahah, my friend helping me almost garbed it with his hands to throw away.
So glad everything is working out for you! I have my new tank little over a month now, and things are great. I just added the last three of my fish. I have a total of 7 fish. They seem to be doing fine, but it's only been two days. A little chasing going on it seems.