at 9 " you can try frozen krill, bloodworms. if these don't work. live nightcrawlers, ghost shrimp, red worms may work but my eels tended to dis-like tehse. Live blackworms also are readily accepted generally though it would take quite abit to fill a 9" eel up. I would try the frozen foods first. defrost them and let them sink outside your eels hide spots, and walk away. check back in awhile, fairly readily it will associate you with food but these guys can be abit shy. As far as I am aware, there is no danger in hand-feeding these fish unless you simply don't want too. I feed my 24" ers by hand and though they have a raspy type mouth and can exert a decent amount of preasure. they have never even come close to drawing blood on me in boisterous feeding times.
btw turning off the ligth ect is def the right thing to do. You shouldn't have much issues once you find something he'll eat. they can be fussy/finicky/picky eaters. So once eating something it's worth the extra hassle of encouraging it to eat more then one type of food.