They always do that or are they just now starting to host it? Mine are so boring, they never leave it, except the female. She is the only one that ventures more than 3" from the nem. The male won't leave it, not even for food.
Some nice lookin clowns. They are strange at times that is for sure.
I dont have a pair yet but, the snowflake, I think has claimed my Large baseball size colony of Red and Green Blasto merleti as its home. Though, doesn't rub up against it just hovers right over and around it. It does swim about the tank once and a while.