I am planning to completely rescape the tank with new rocks. This will involve removing all existing rocks and corals the put in new rocks and glue some of the corals back. Some of the existing rocks will go into the frag tank if there are corals on them. Will move some corals at a later time. The complete process will take about 2 to 3 hours. To minimize the impact to the fish do your suggest moving them to a bucket temporarily or leave them in the tank?