Peppermint Shrimp vs. Aptasia Experience

[Cheebs]

I've got two in my 75.  I barely ever see them, infact I thought they had died during the recent tank move I had to do, until I spotted them one night.  They take care of any aptasia that pops up in the tank, except big specimens.  I've got this one big sucker I'm trying to get rid of, the shrimp don't seem to have touched it.