Only one of my two clownfish hosting RBTA?

[Myka]

I agree with Brad (and Ray).

[monocus]

no matter what type of anemone i have put in my clowns stay at the top corner of my tank

[Apo Reefer]

Sean,

Don't worry about the Darwin not hosting right now, it will eventually go with the Black Ice and will be hosted.

My first pair of clowns only host the Female on the get go, then after a couple of weeks the male went with her and stayed on their host RBTA for good.

Hope that give you some peace of mind... go get some sleep will you.