The peppermint shrimps can be hit or miss as far as being safe with corals goes. Personally I would do a Fire shrimp instead, much prettier.

Also Lawnmower blennies can be difficult to keep long term unless you always have plenty of hair algae growing, which you probably don't want. A small percentage of them will take prepared foods so you might want to try and find one that is eating spirulina flake, formula II, etc.
The other option is an easier type of blennie, midas blennies and bicolor blennies are two of my favorites.