i have this one damn patch thats nestled in between my candy coral, and teh stuff grows like nobodys business. i have a black sailfin blenny that eats it all except the stuff between the coral, 2 emerald crabs that turn their claws up at it, a rainfordi goby that doesnt think much of it and a bunch of snails/crabs that wont go near the stuff. its driving me nuts! like rye said, a toothbrush and a fine net seem to be the best methods of control!
good luck
jon