Give him time to adapt to new surroundings. Mine took days to start eating at first and recently went two weeks refusing to eat. At that size you can try blood worms but maybe some red wrigglers or ghost shrimp. Mine wanted to hunt when small but now takes chunks of market shrimp.
How big are the bass? May not be best tank mates for a baby eel due to speed, appetite and aggression. Perhaps somm p-bass experts could weigh in on it.