Recently, I've had horrible luck with carpet surfers. Firefish(asking for it), six-line(given),royal gramma(yeah, I know) and most recently, a yellow-tail damsel(rediculous). It's a 20 gal nano with no hood and I intend on keeping it that way to maximize evaporation and CO2 dissipation. Currently there's a female occelaris clown, green chromis, banggai, PJ and a lizardfish with a colony of zoas, mushrooms and hermits. Before I get a bunch of crap on how my tank is overstocked, what's another reef-safe fish I can add to this tank that won't jump and kill itself?