I don't think it unusual for new fish not to eat for a week or more. I'll bet he comes around. At least he is biting. I'd get more concerned when new fish let food go by without even noticing it.
His infatuation w/the anenome may be like a new love affair. But like new love affairs go, the newness will wear off
and he'll probably start eating and maybe even feeding the anenome.
I rememeber my fist love ... or was it a later one... oh nevermind.