well, i still have not seen him eat (or move). he only swims around at night. i can tell by the holes he digs to sleep in.
my other solefish eat mostly frozen blood worms. he is not interested in those yet.
however, most of my cherry shrimps have disappeared. so it is safe to say that he has been eating them at night.
not sure how big he is going to get. i am guessing the size of my palm and up.
it is my first time keeping this species. before that, i've had brackish hogchockers. those guys were a lot less picky foodwise and way more active