Catching fish

I've determined that my 2 3-stripe damsels are beating up on my other fish
in my 75G tank and so I need to remove them. Trouble is, 1) they're small,
2) they're fast, 3) there's 80 pounds of live rock with lots of nooks and
crannies to hide in, 4) there's other fish/inverts I don't want to
terrorize by pulling out all the rock. So, what ideas/techniques can you
suggest to capture them? Suggestions I've seen so far include a) leaving
the net in the tank to get them used to it, b) try to catch during feeding
time, c) try to catch early in the morning when they are groggy (problem is
they don't sleep out in the open).

Any other suggestions appreciated!
Scott