I've had a pair of percula clowns for over 4 years. Can hardly get them to leave the upper left corner of my tank. I put a sebae anemone in last june and save for one or two nights (my female was rolling all over in the anemone) they want nothing to do with it.
I've had a similar experience, our first tank 2 years ago was a 29g biocube, we got a T. Percula and a Sebae Anemone, Clownfish didn't want anything to do with the Sebae. We traded in the Sebae for a RBTA because we wanted to do some corals and the Sebae liked to move, still nothing with the Bubble Tip, the T. Percula would sleep in the top left corner of the tank.. We even tried a few tricks and tips, we isolated the clown and the anemone together in a bucket, we tried to feed the clown near the anemone, nothing..
So we let it be and we soon forgot about it, we upgraded to a 75g after a year with the bio-cube and we really wanted a Maroon Clown for the deeper red color, so we traded in the T. Percula, for a Maroon, hosting at this point wasn't even a thought in our mind, plus the LFS guy said that because the Maroon Clown was tank bred the likely hood of it hosting in the Bubble Tip may not ever happen, we loved the look of the clown so we figured we just weren't destined to have a clown hosting anemone..
Well low and behold we put the Maroon in the tank in the evening, sure enough just swimming around paying no attention to the anemone, woke up the next morning, fed the fish, went to work. When I returned home from work I couldn't find the Maroon Clown. I thought she jumped out and the dog ate it, low and behold she was all up in the Bubble Tip.. It really is hit or miss..
Frank