i take them out and put them in a bucket along. Dont reagrange it if their are fish in there. They might already have their spot picked out and puting them in a bucket and then back into a whole new tank to them would be really stresful to them.
I've rearranged my LR many times. If I get too close to my eel, he just scurries away. The Damsel and puffer fish go to the opposite side of the tank. Whew! good thing I dont have any Lions or Fox faces.