ok well you can add a yellow tang for sure...i dunno what u guys r talking about. if u really want those percs, u can add the flame angel w/ a yellow tang and maybe any kind of gramma. there are alot of options for 55 gallons. i would not put in a large angel though, and some tangs are not fit for 55 gallons. u could also do lion fish, snowflake eels, puffers, and any kind of clowns. if you dont like the look of the yellow tang, you can put in a blue regal tang in for sure. the only bummer about blue regal tangs is that they are the most prone to white spot and saltwater ich!!!!!! right on with ur tank bro