I had a mated pair of true percs in a GBT for many years. They spawned quite often. The bubble tip is not supposed to be a host anemone for them but the took to it right away when introduced.
Also had a Clarki in a RBT for a while until the anemone got to big, took the anemone out and tried to replace it with a plate coral, he never went for it.
You see the weirdest combo's with clown's and host so you never know.
Tony