Fussy Clownfish and Cabbage coral?

[DriftingNemo]

So I didn't really want to start two different threads so I decided to put it all into one.

 

I have this Ocellaris Clownfish that I bought a week ago. He has got some sort of internal parasite due to its white poop. He would ignore the pellets I feed my other fish, but he has taken interest in New Life Spectrum Thera A. By that I mean, if a piece floats by him, he'll put it in his mouth and spit it out again.

 

Would he eat some sort of frozen food? The clownfish has been in my tank for over a week now meaning that he has had something to eat, but I just haven't seen him eat anything. This confuses me....

 

Also, I've been offered a Cabbage coral from a local reefer. Can these corals live in low light? I've got some GSP that does well in my tank.