I am maintaning a 55 gallon tank and the current residents are 1 Blue tang, 1 clown fish (yeah, see the Nemo thing here) 1 lawnmower blenny and 1 bicolor angel. They want to add another fish or two. I was thinking something with a lot of movement and color like some wrasses or firefish. I have already informed them that the blue tang will eventually outgrow the tank and another home will have to be found but that's not for awhile. Any suggestions on tankmates?