upgrade advice pls

I have a 10 gal tank. I just got a 30 gal to make a slight upgrade. My question/dilemma is this. I have to take down my 10 gal to put the 30 in its place. Right now all that's in my 10 gal is live rock & a crab & snail. I have a 5 gal that I was planning on filling with the water from my 10 gal & then just transferring the critters right over. Should I take the remaining water & sand from 10gal & put it in the 30 gal to give it a kick start to cycling?

Thanks for the input!