nice. Moving rock with wet newspaper has my vote as well. Water over them is better but you need to be able to finish moving the tank before you passout lol. Fill the tank ASAP with new water and as much old water as you saved and get the rock in there. The sand will most likely need to come out as well, with acrylic being weak and unsupported may spell disaster. Fish will live fine in a 5gal bucket with old tank water for a period of time. Depending on size, try catching the fish in a clear container to prevent stress and air expossure. good luck