According to Google, looks like that both clowns will host Magnificent Sea Anemone (H. magnifica), Giant Carpet Sea Anemone (S. gigantea), and Merten's Carpet Sea Anemone (S. mertensii) in the wild. I believe all of those are considered tough to keep. While not natural hosts, bubble tip and long tentacle anemones might be worth a shot given they are supposed to be easier to keep and because people have successfully gotten clowns to host them. I have an occillaris hosting a LTA in my 9 gallon tank.