i have a 55 gal with 30 gal sump/fuge. tons of rock and and it is a reef tank. in it i have 2 clowns (the cheaper ones) sorry cant remember the name, and a royal gramma. 3 shrimp and the cuc. i would like a larger colorful fish that will swim all over, but i dont know what to get.... any ideas? the lfs guy suggested a blue tang,but i know it wont be good for the tang.