if you can reset up as soon as you get there I would just bag all fish and coral. then drain water in bucket and put live rock in there. keep fish and coral in a small cooler I have styrofoam boxes you are welcome to have. also I would have about 5 gallons of salt water mixed. as for cube i would leave about half inch water and be very careful not to stirr it up. when refilling use a bowl or cup to diffuse the water as to not disturb sand bed. top off water to operating levels and then acclimate fish just for temp. and add fish without water from bag as to not add dirty poop water, due time in bag.you can also add all livestock to a bucket or a good ice chest and use an air stone, remeber fish and coral stay in bags for almost 48 hours before getting to store.