no, he's right, the scarlet hermits tend to be less aggressive.
How long has your tank been up and running??
I would start with 20 Nassarius Snail for the sand, 10 to 20 Ceriths for the rocks and walls, and 10 scarlet hermits. Though I have the blue legs and dont have too many problems, Just be sure to have lots of extra shells.
Do you have a lot of algea, if so, then add a couple of mexican turbos also.
Then add more if you think you need them
T