[mopardwh]

Air is not going to hurt the sand. Are you planning to use new equipment? Adding more rock? More sand? Just more everything at one time and add more water. Pretty simple. Then add more sand or rock a little bit later.

 

[mopardwh]

No cycle. Your just moving everything from one piece of glass to another. You'll be stirring up deterius by the move but it will be fine. Just do a couple of water changes the next few days and some cleaning.

I've moved several tanks. Its not a big deal unless your changing lots of things or more than 50% water etc.

 

[mopardwh]

I think you should look at more options since you have yet to buy the new tank. 33 long has a footprint of roughly 4' x 1', a 75 or 90 would be 4' x 1.5', and a 120 at 4' x 2' http://www.aquariumdimensions.com/ You will always want bigger so might as well jump more than 13g if you could spare at least 6 inches in depth.

Very good point! Of course that would require a lot more coin all the way around.