True Percs (and false for that matter) do not, as a rule, associate with Bubble Tip Anemones. Having said that, there are exceptions. one of my 2 true percs lives happily in my BTA and both are very healthy and happy right now. The BTA really gets on the move from the moment he goes in the tank, so be prepared for him to pick a spot you don't like. Luckily, mine took to a great spot high up in the tank. they typically will want to hide their "stalks" and only expose their tenticals. They will thus stay in a hole. Luckily, mine chose a hole that is vertical so its full set of tentacles is on display.