diy anemone

They make artificial ones you can buy that are pretty realistic. Some of the breeders use them, you can try searching the web for info to either buy or make one. But when one comes up for sale, they are pricey.
But like you've already discovered, they can and do host a lot of random things. A lot of breeders use little ceramic pots or even coffee mugs, which the clowns will host and lay eggs on. My pair has hosted my torch and mag-float in the past, and are now currently hosting a patch of zoa's. And I believe Nano had an experience with a pair trying to host one of his clams even Some host and some don't. They DO NOT need an anemone by any means for any reason. I made that mistake once, and the outcome was not pretty at all.