i had a &*#% of a time getting out some
peppermint shrimp that were eating my mushrooms. here is how i finally got them. i got some plexiglass and took out enough rock to divide the tank in two. now you can leave at least part of your tank undistrubed. then if you can, close in on the fish until you have to remove minimal amounts of rock. the plexiglass wasnt a perfect fit but it was pretty close. it took two people to get 'em.
we put the live rock on a towel and left it there only about 10 mintues. apparently that was too long because the
coraline algae turned white from the exposure. it has since come back but it took a while. i dont know if it hurt the coraline, but it definitely concerned me for a while.