How do you get rid of Caulerpa prolifera??

Set up my 75 gallon tank a short while back and had a "few small" pieces of
rock with caulerpa prolifera on them. Not really thinking this would be a
problem I put them in the tank and now have it all over the rocks in the
tank. Is there an easy way to get rid of this without hurting the other
inhabitants in the tank? This stuff is taking over and I need to get it
under control. I currently have a few fish that eat a little bit of it but
not enough to control it. I can't leave the lights off either as I have a
lot of anemones and corals dependent on the lighting.

TIA--Susan