If its as bad as it can be. then peppermints wont do the trick. I had a tank fullof them, some as big as a fist. lol I ended up nuking the rock and starting over. If you can I would start going after them with joes juice, kalk
paste or aipastia x. Even better, see if you can borrow a zapper from a reef club member if you are in a club, or maybe check with your lfs
. I borrowed one from a fellow reefer and it did wonders for that particular tank. It just melts them away to nothing.
My 60g was too far gone even for a zapper though. :-(