If you really feel that you need to put a fish in your refugium I'd suggest something that would make little, if any, dent in your infauna population. Perhaps one of the following: Hawkfish, Clownfish, Dwarf Lionfish, or an Angler Fish (although odds are you'll rarely see it, and some may get too large for a 33g). These fish would tend to leave your infauna and macroalgae alone, and you could just feed them large foodstuffs like krill and so forth (and your bristleworms would appreciate any leftovers no doubt). I'm also assuming that you don't have any shrimp or hermits in the refugium (they'd also be considered "predators" in a 'fuge).
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