Hi Kate,
congrats on the new larger tank! yeaa....

Your fishys will be so happy!
lets see... about your questions..
Just make sure when you carry the new tank that the weight is distributed evenly. You should be ok... of course, move it while its empty.

Even tho you are in a hurry to add the fish, the only quick way to do that is to use the Bio spira. Second fastest way is to use some tank media from an established filter and gravel from another tank and some of the water as well.
BUT your going to have to let that silicon dry for a few days tho... resealing the corners doesnt seem to be so hard to do, just make sure you wipe off any excess quickly or you will have a dried mess on your hands.
Your guys have been in that other tank for so long.. a few more days or a week wont hurt. Make sure you test the water regularly to see where you are in the new cycle...
good luck with the new tank!

~ kate