Do you have SPS in that tank? (( and is it the same one as in your sig? )).
Some of the natural hosts for Percs are Gigs (( Stichodactyla gigantea )), Mags, (( H. magnifica )) -- both tend to be poor shippers, difficult to keep and most of the time stay on the rocks. H. Crispa is also a natural host, they tend to stay on the sandbed. They do get rather large, however assuming that you find one that isn't bleached/dyed aren't all that difficult --- as far as anemones go.
BTAs (( Entacmaea quadricolor )) would work, but I personally wouldn't keep one in an SPS tank.
I currently have a pair of SI percs, and they are hosted by a Haddoni, prior to that they were hosted by an LTA (( Macrodactyla doreensis ))