What are your favorite reef safe inverts? (corals and nems excluded)

Hey guys! I have two skunk cleaners, a peppermint shrimp, an emerald crab, mexican turbos, and a feather duster as my non anemone/coral inverts.

What are your favorite reef safe non anemone/coral inverts?

I'd love to hear what some of you guys and gals have in your tanks!