I also have a pair of killies in the tank now too, which I would like to include with the set up. This way, you have something to look at even when Smashy is hiding
*sigh* no he won't kill them, he's a smasher not a spearer, and he shows zero interest in them. He's only about 2 inches long, and these are Sheepshead killies so they're only slightly smaller than he is.
wish i was closer and/or not broke, i love mantis shrimp. i've got a 3" N. wennarae in my 29g reef with 3 other fish and he seems to even ignore most of my snails and crabs.