Try it and let us know...
If there is any LR in your tank they will disappear.
So to get them out you have to remove all of your LR and potentially jeopardize whatever goodies you have growing on there... plus you have to aquascape all over again... and even in an empty tank those little buggers will give you a run for your money.
This doesn't even take into account the stress of all of this is going to cause on your other fish.
It is a giant pain in the butt. Do not get damsels if you do not plan to keep them over the long haul.
Katie