Christmas Tree Rock
The colorful featherdusters ase Christmas Tree Worms.  The "rock" is a type of Porite.  This rock has blue, orange, green and yellow worms.
Keyhole Limpet
Omnivores, will eat soft coral!  There are dozens of these in the tank ranging in size from 1/8" up to 2".  They are great at cleaning the glass.
Critters
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