I have a pair of true percula clowns in my 58. They have taken up residence in my bubble-tip anemone. It took them a couple of days to figure it out, but after that they rarely venture far from it. I have heard other people having had a hard time finding an anemone that their clowns like. You may just have to let them be for awhile and maybe someday they will take to an anemone or another coral in your tank, which sometimes happens.