Stock suggestions for 5.5' shallow reef

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I lost a purple fire fish and a pistol shrimp. Rest of my fish (flame angel , 2 clowns, azure damsel, banggai Cardinal has all been safe. ). My blue line cleaner warse jumped into the rear sump once a few months back but haven't had a issue since


I actually bought clear mesh for the potential of a top. Just avoiding using/building one