Pepps worked well for me and for all i know they were the ones cleaning up the small ones!I am so sorry to see this you must be devastated!
I'm sure you have a plan and I'm not sure this will help but I had a couple get into my tank and the only thing the peppermint did was become lunch for one of my fish however a Copperband butterfly cleared it up very quickly.
To top it off he is a great fish ... strange at times but a great fish to have in the tank.
I did try a copperband before it really got out of control but the yellow tank didn't approve. I them got a kliens and he was good, straight into them but he started tucking into sps polyps and lps just as quick!