What clowns do you have? I know you mentioned you have a long tentacle anemone already.
I get that in an aquarium fish don't always behave as in the wild, but there are natural hosts for each clownfish species that they will be more inclined to host with.
I've had all my percs/occellaris hosted by bubble tips. some hosted immediately but some required coaxing. But once I got a Ritteri anemone they went to that and NEVER looked back. they won't go near a bubbletip anymore.
My maroons are in the bubbletips now.
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