Cherub angels are awesome little guys with the pugnacious attitude of a big fish. Mine put a Maroon female clown in its place & the Maroon was 4 times it's size.
Does your aquascape allow a new fish to escape into the rock work? If so, then a royal gramma or black cap basslet (expensive but beautiful) are completely reefsafe.
A lawnmower or bicolour blenny would also be a cute & useful addition (algae eaters). Since they usually hop around the rock work, the tank will most likely ignore it.
Anthony
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