Mine would only eat about the same and it is similar size, the key with them is to not over feed, especially not fatty foods and try not to feed until the bump of food has gone down. I feed mine a small amount every couple of days and I wouldn't worry about skipping a few.
If you feed worms next time then third time try something else such as a bit of mussel chopped or a small bit of fish, I expect it will eat fine now, just don't let it fix on worms, don't be aftraid of not feeding for a week and then try another food.
I am just training a fire eel that is over 18 inches and the previous owner fed it 150 live river shrimp per week, it has taken a week to get it on to worms and now I need to get it on to frozen foods then pellets ideally.
If you feed worms next time then third time try something else such as a bit of mussel chopped or a small bit of fish, I expect it will eat fine now, just don't let it fix on worms, don't be aftraid of not feeding for a week and then try another food.
I am just training a fire eel that is over 18 inches and the previous owner fed it 150 live river shrimp per week, it has taken a week to get it on to worms and now I need to get it on to frozen foods then pellets ideally.