although not always an option, i prefer naturally occurring host associations. as many here have reported it could take a long time for a false percula to adopt a bta. i like gsm's/bta's but i think the color gets a bit lost in a rose. i'd rather see them in a bta with a purple column/grey-white-pink tips morph, personal preference. i wouldn't recommend A. polymnus/bta because they're hard on their anemones. the smaller clown species in general spend more time close to their anemone, vs. A. clarkii which most likely will swim around the tank more than playing in a smallish bta. ime there are exceptions, such as A. polymnus/S. haddoni, P. biaculeatus/E. quadricolor...
good luck