Sometimes it just takes time. There are a few option but what I did that worked great was bait them into the anemone.Â
Get some chopped krill or mysis (or both) and feed the anemone with a turkey baster. Squirt only a little bit in. The other fish will avoid the anemone but they clowns might brush up to it to get the food. After a few times of doing this they will be brave enough to go right into the anemone. Once they get the gist of it they should host.Â
I've never herd of this method before but it's what worked for me. Let me know if it works for you because this might be a good method for all who have this problem.
Sculpin