What kind of clowns are they?
I had an RBTA in a tank with an Ocellaris pair for over 6 months, they never went near it, or even looked at it. Even plastered pictures of clowns in RBTAs on both ends of the tank for a couple months. I remember seeing a compatibility chart somewhere staing which types of clowns hosted which type of anemones.
I think i saw tomato clowns hosting them while diving in the Phillipines last year. Not that they won't but...
Oh wait, just realized that looks like my old Nem

Hi Paul!
GLWS!